What on Earth?

1. S01E01Season's bestLake of BloodFebruary 10, 2015 8.8A massive tsunami hundreds of feet high that never touches land; a huge sinkhole in Florida; a secret underground base in China; a lake of b
2. S01E02Lost City of GoldFebruary 17, 2015 8.0Strange barren rings in the Namib desert; An island the size of Manhattan disappears without a trace; a lost city in the middle of the Amazo
3. S01E03Secrets of the SaharaFebruary 24, 2015 8.8How the Eye of the Sahara, a beautiful 25 mile structure, is formed remains a mystery; incredible clouds emanating from an island in the Ind
4. S01E04Finding SodomMarch 3, 2015 8.7NASA astronaut Mike Barratt on the International Space Station photographs a strange ring in the ice on Lake Baikal, the world's oldest, dee
5. S01E05North Korea is BurningMarch 10, 2015 7.5A possible smoke screen over North Korea concerns military analysts; an amateur archaeologist makes a fantastic discovery of not one but two
6. S01E06Nazi Ice FortressMarch 17, 2015 8.0Strange images of craters in a line across Missouri; Strange satellite images of lights at night in uninhabited areas of Australia and the D

Season 1 ranked & reviewed

1. S02E01Season's bestFinding Vietnam's Lost POWsJanuary 26, 2016 8.3Desperate signs from lost veterans in Vietnam captured by satellite. A fleet of massive ships stranded in the middle of a vast desert. Stran
2. S02E02Secret of Doomsday MountainFebruary 2, 2016 8.0Satellites find American stealth technology deep inside China; an unidentified cloud swamps America's skies; something very large is lurking
3. S02E03Lost City of the KalahariFebruary 9, 2016 7.7Satellites locate strange spiral markings in the remote African desert; A strange black blob off the coast of Florida. Satellites observe a
4. S02E04Who Built Supervillain Island?February 16, 2016 8.0A satellite spots a set of huge arrows in the badlands of the American west. A blood red waterfall stains Antarctica's snows. A plague of hu
5. S02E05Curse of the Lost KingdomFebruary 23, 2016 8.0The face of Christ is found in a field in Hungary. A photo that claims to show who shot down a passenger jet in Ukraine. A sinister shape in
6. S02E06Hidden Tomb of Genghis KhanMarch 1, 2016 8.3A strange structure is found in Mongolia. Is it the lost tomb of Genghis Khan? Bizarre rings in Spain could lead to the lost city of Atlanti
7. S02E07Bible's Greatest MysteriesMarch 26, 2016 8.3A US spy satellite may have sumbled upon Noah's Ark; NASA may have found the Garden Of Eden; possible evidence of the destroyed city of Sodo
8. S02E08Secrets of Lost CitiesMarch 29, 2016 7.5Satellites find a great scar in the desert, it might be the key to finding the last wonder of the ancient world; Clues to the location of in
9. S02E09Military MysteriesApril 5, 2016 8.0A collection of military mysteries; Satellites find stealth technology deep in China; Signs of MIA's in Vietnam, Strange smoke clouds over N
10. S02E10Strange Things in the DesertApril 12, 2016 8.0Satellites locate strange spiral markings in the remote African desert; a fleet of massive ships stranded in a desert of drying Aral Sea; la
11. S02E11Unsolved MysteriesApril 26, 2016 7.7An odd structure that could be the lost tomb of Genghis Khan; mysterious dead patches in the desert that science can't explain; eerie sights
12. S02E12Curse of the AbyssMay 3, 2016 8.3Mysterious sightings in the Bermuda Triangle that could solve an age-old legend; a huge tsunami is heading straight for Hong Kong, then sudd
13. S02E13Stranger Than FictionMay 10, 2016 8.0A strange blood trail leads a satellite investigation; odd spirals appear in the Kalahari desert; a bizarre pattern off the coast of South K

Season 2 ranked & reviewed

1. S03E01Lost Treasure of the Grand CanyonNovember 15, 2016 7.5Strange spots near the Grand Canyon may hold clues to the legendary treasure of a notorious bandit; satellite images could explain desert ru
2. S03E02Mystery in the OutbackNovember 22, 2016 7.5A giant carving of a strange creature suddenly appears in the Australian Outback; mysterious bright green lights illuminate the seas around
3. S03E03Riddle in the RuinsNovember 29, 2016 7.5Strange black holes appear near Egypt's ancient pyramids, and new evidence points to a disturbing conclusion. Ruins in Peru suggests that th
4. S03E04Stonehenge of the Holy LandDecember 6, 2016 7.5Legends of ancient giants surround a mysterious monument in the Holy Land. A bright pink lake could point to a strange, undiscovered new spe
5. S03E05Did We Find Flight 370?December 13, 2016 7.5Investigators find a new clue about the missing Malaysia Airlines flight that disappeared in 2014; an astronaut spots something strange in t
6. S03E06Gateway to EdenDecember 20, 2016 7.5A buried monument offers new evidence about one of the Bible's greatest mysteries; an ominous shadow engulfs the Pacific Ocean; scientists h
7. S03E07Dagger of TutankhamunJanuary 3, 2017 7.3A dagger sealed in King Tut's tomb for more than 3,000 years is made of a metal that seems to have extraterrestrial origins. A massive swast
8. S03E08Season's bestRaiders of the Holy LanceJanuary 10, 2017 7.7A heavily armored force takes over one of Syria's most ancient archaeology sites, prompting fears that its relics are being stolen; tanks ap
9. S03E09The Swastika ConspiracyJanuary 17, 2017 7.5A giant swastika appears in a forest in Germany; a strange pattern is etched into the desert near the famous Nazca lines, but archaeologists
10. S03E10Inside El Chapo's EscapeJanuary 24, 2017 7.5Satellite images reveal how El Chapo escaped from a high security prison in Mexico; mysterious patterns in the Australian outback and the Ka
11. S03E11Ghost of ZorroJanuary 31, 2017 7.7A giant letter Z is carved into a Mexican hillside, evoking the mark of a legendary outlaw, Zorro; a strange sighting in Germany points to s
12. S03E12Curse of the Sea MonsterFebruary 7, 2017 7.5A strange mass breaches surface of an ocean near Antarctica, sparking rumors of a mythological sea monster; an area of the US-Mexico border
13. S03E13Strange Symbols in the DesertFebruary 14, 2017 7.5An amateur archaeologist finds strange symbols scratched into the Kazakhstan desert; CIA surveillance photographs show what appears to be a
14. S03E14Bloody Secret of the Lost CityFebruary 21, 2017 7.5A vast structure buried in the sands near the legendary city of Petra points to a bloody past; when terrorists kidnap more that 200 schoolgi
15. S03E15Lost Empire of the AmazonFebruary 28, 2017 7.5New evidence could lead to the discovery of an unknown ancient civilization in the Amazon rainforest; an island disappears and investigators
16. S03E16Siberian Hell PitMarch 7, 2017 7.5A massive chasm appears in a remote part of the Siberian forest and locals call it a gate to the underworld; images of a nuclear missile lau
17. S03E17Hunt for El DoradoMarch 14, 2017 7.5Strange images from the jungles of Colombia could lead researchers to the legendary city of El Dorado; a bright green swirling spiral appear
18. S03E18Mystery of the Mummy DesertMarch 21, 2017 7.5New evidence could reveal the remains of an ancient Roman city thought to be lost forever; strange images from a remote and empty desert cou
19. S03E19Forbidden City of the MayaMarch 28, 2017 7.5A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya; satellite images might point to
20. S03E20The Curse of MerlinApril 4, 2017 7.5The myth of Merlin is associated with an arrangement of stones in northern France; satellite images might finally explain this ancient riddl

Season 3 ranked & reviewed

1. S04E01Dracula's TombOctober 17, 2017 7.0Strange mounds in Transylvania might pinpoint the location of the tomb of the bloodthirsty tyrant believed to have inspired Dracula; a myste
2. S04E02Fountain of Youth Found?October 24, 2017 6.7A strange structure shaped like a giant shark might point the way to a lost civilization's fountain of youth; a massive hurricane heads towa
3. S04E03Mafia Ghost ShipOctober 31, 2017 8.0A ghost ship with links to the mob suddenly appears on a California beach; strange markings could be a coded message that reveals a plot to
4. S04E04Beasts of the Lost JungleNovember 7, 2017 7.0A ghost town covered in a strange, white power emerges from a lake in Argentina; upon the discovery of a lost jungle in Africa, scientists e
5. S04E05Season's bestMystery of Fang ForestNovember 14, 2017 8.3A strange forest of razor-shape stones could be home to an undiscovered Hobbit-like humanoid species; when a man-made island mysteriously ap
6. S04E06Village of the DamnedNovember 21, 2017 7.5A forbidden island points to a strange South American town that locals claim was the home of Adolf Hitler. New data from NASA satellites mig
7. S04E07The Minotaur's LairNovember 28, 2017 8.0A strange lake in Transylvania is the home of an abandoned village and a terrifying secret. When an labyrinth is discovered on an island onc
8. S04E08The Lost City of GoliathDecember 5, 2017 7.7A lost city near Jerusalem might have been the home of Goliath; bizarre underwater formations might point to a top-secret US weapons testing
9. S04E09Finding King ArthurDecember 12, 2017 8.0An abandoned megacity in a remote jungle might be the home of an ancient treasure and a dark secret; when a mysterious circular stone struct
10. S04E10Treasures of ValhallaDecember 19, 2017 8.0Evidence of human sacrifice for the Viking god Odin; shedding new light on Genghis Khan.
11. S04E11Nazi Gold Mystery (aka Hitler's Lost Gold)January 9, 2018 7.3New evidence might finally identify the hiding place of the billion-dollar Nazi gold train; a discovery of a long-lost settlement rewrites t
12. S04E12Temple of BloodJanuary 16, 2018 7.3An ancient man-made volcano might reveal buried treasure and bloody human sacrifice; when NASA discovers a strange pattern in the Arctic ice
13. S04E13North Korea's Forbidden IslandsJanuary 23, 2018 7.7Man-made islands are spotted near a North Korean missile facility; an unexpected find in a remote desert leads experts to a lost city of gia
14. S04E14Cannibals in the Ghost CityJanuary 30, 2018 7.3An abandoned city in the African jungle may be haunted by the malevolent spirits of cannibals; Mount Vesuvius shows signs of an awakening, a
15. S04E15Curse of MedusaFebruary 6, 2018 8.0Researchers investigate a strange glowing lake reported to turn things into stone; a structure in Africa that resembles Stonehenge is said t
16. S04E16Nazi StonehengeFebruary 13, 2018 7.7A mysterious Stonehenge-like structure in Russia may have links to the Nazis; experts uncover clues to a mega-tsunami with the power to deva
17. S04E17Hunting the Ark of the CovenantFebruary 20, 2018 7.7New discoveries lead investigators to a crypt rumored to hold the Ark of the Covenant; when a great white shark is killed, experts suspect a
18. S04E18Forbidden City of Inca GoldFebruary 27, 2018 7.7Treasure hunters have searched for a lost Incan city of untold wealth for a century, but new technology might finally locate its riches; a s
19. S04E19Ghost Ship of Hell IslandMarch 6, 2018 8.0A ghost ship is found abandoned on a remote island that's home to one of the world's last uncontacted tribes; a strange labyrinth in Sicily
20. S04E20Mayan Armageddon: The New EvidenceMarch 13, 2018 7.3New evidence might reveal how the Mayans vanished; when scientists investigate an abandoned settlement, they discover traces of ritualistic

Season 4 ranked & reviewed

1. S05E01CIA Killer MonksJanuary 8, 2019 8.0Something strange in the Himalayas could be evidence of a top-secret CIA program to turn monks into killer agents, and cutting-edge science
2. S05E02Monsters at Fort MadnessJanuary 15, 2019 8.0Alien monoliths haunt the coast of England. An obliterated jungle points to a brutal narco gold rush. Evidence of a strange blood-red creatu
3. S05E03Satan in SiberiaJanuary 22, 2019 7.7A satanic symbol points to an army of the dead in Siberia. A massive stone giant in a remote desert. Evidence of a Russian doomsday device r
4. S05E04Season's bestCurse of the Ice ZombiesJanuary 29, 2019 8.5Zombie reindeer haunting the mountains of Norway. Strange circles in the sand by a secret US military base. A gigantic streak in the Arctic
5. S05E05Ghost Fleet of Cannibal BayFebruary 5, 2019 7.0A fleet of sunken ships points to ghosts, cannibals, and bloodshed in early America. Strange Arctic holes that NASA can't explain. Near Area
6. S05E06Finding Jack the RipperFebruary 12, 2019 7.3New discoveries from space give experts new clues in the hunt for Jack the Ripper. When a strange object crash-lands in Antarctica, experts
7. S05E07Mystery of the Desert ShipwrecksFebruary 19, 2019 7.3Hundreds of shipwrecks in the middle of a desert in Africa. A ghost town where hundreds of its inhabitants have mysteriously died. Something
8. S05E08Blood in the Garden of EdenFebruary 26, 2019 7.7A site that could be the Garden of Eden hides a deadly secret. When a gateway to hell suddenly opens, experts investigate where it leads. A
9. S05E09Phantoms in the Chamber of SecretsMarch 5, 2019 7.7Evidence of a mysterious 5,000-year-old structure suddenly appears in Ireland. A top-secret machine that can see back in time. A satanic pen
10. S05E10Cannibal Death PitMarch 12, 2019 8.0A strange circular forest next to a notorious cannibal site. When an eerie crater is spotted in Siberia, experts uncover if it could be evid

Season 5 ranked & reviewed

1. S06E01World's Deadliest ThreatsJune 6, 2019 7.7The world's most dangerous threats are in top-secret locations all over the planet, and using cutting-edge technology, experts reveal the tr
2. S06E02Monsters of Diamond DesertJune 13, 2019 8.0An abandoned ghost town in a remote desert with a dark past. When a strange facility is spotted in Russia, experts investigate if it's hidin
3. S06E03North Korea Death StarJune 20, 2019 8.3When satellites spot a mysterious structure in North Korea, experts investigate if this sinister evidence points to a looming nuclear threat
4. S06E04Season's bestAliens of the Infinity WarJune 27, 2019 8.5When a strange pattern appears in a field, experts wonder if its an extraterrestrial response to a message sent to an alien star cluster in
5. S06E05The Cave to HellJuly 11, 2019 7.7When a sinister cave is discovered in a remote corner of Iceland, experts uncover a secret underworld tunneling to unknown depths, and using
6. S06E06Terror of the Ice SnakeJuly 18, 2019 8.0In the white ice of Antarctica, satellites discover a mysterious trail of sinister black objects, and when experts discover that it's moving
7. S06E07Curse of Genghis KhanJuly 25, 2019 8.0When a strange structure is discovered in the Gobi Desert, experts investigate if this mysterious site could reveal the whereabouts of lost
8. S06E08The King at RoswellAugust 1, 2019 8.0When a strange, red plane is discovered near the sight of the Roswell UFO incident, experts wonder if the aircraft has Nazi or extraterrestr
9. S06E09Treasures of Monster GraveyardAugust 8, 2019 8.0At a mysterious site in the Gobi Desert, experts have discovered a monster graveyard, and this groundbreaking find contains the treasures of

Season 6 ranked & reviewed

1. S07E01Nazi Doomsday ForestJanuary 9, 2020 8.0When mysterious structures are discovered deep in a remote forest, experts investigate if this strange site was the long-lost birthplace of
2. S07E02Bermuda Triangle of SpaceJanuary 16, 2020 6.0When instruments on the International Space Station suddenly malfunction every time it passes over a mysterious site in the Atlantic Ocean,
3. S07E03Chernobyl's Nuclear MonstersJanuary 23, 2020 6.6When strange circles of reindeer appear in the remote tundra of Sweden, experts investigate if this mysterious event could be evidence of fa
4. S07E04Curse of Phantom IslandJanuary 30, 2020 7.8When an island off the coast of Mexico suddenly disappears, government officials scramble to find an explanation; cutting-edge technology mi
5. S07E05Armageddon USAFebruary 6, 2020 7.7When the people of a thriving Midwestern town suddenly disappear, they leave behind an eerie ghost town with a dark secret; experts use cutt
6. S07E06Season's bestAmazon's Secret NightmareFebruary 13, 2020 8.3When satellites spot anomalies in the unexplored Amazonian jungle, experts wonder if they've discovered relics of a lost civilization; an on
7. S07E07Ghost Town TerrorFebruary 20, 2020 8.0When satellites discover a strange abandoned city frozen in time, experts investigate what caused the people who lived here to disappear ove
8. S07E08Imhotep's Lost LabyrinthFebruary 27, 2020 8.0After satellites spot an anomaly near the Step Pyramid of Djoser, Egypt's oldest pyramid, experts uncover a long-lost labyrinth that could l
9. S07E09Lost Tombs of the Gold KingdomMarch 5, 2020 8.0Strange satellite images taken above the Nile Valley could point investigators to long-lost relics buried in an unexplored city of the dead;
10. S07E10Hunt for AtlantisMarch 12, 2020 8.0New satellite evidence reveals a mysterious spiral structure from space, and experts speculate that it could be the lost city of Atlantis; u
11. S07E11Ruins of Cannibal CityMarch 19, 2020 7.3When an extreme drought hits Spain, the ruins of a long-lost civilization suddenly emerge, and using cutting-edge technology, experts invest

Season 7 ranked & reviewed

1. S08E01Zombietown USAAugust 27, 2020 8.6Satellite images capture evidence of an abandoned town hidden in the American wilderness, and as experts analyze this new evidence, they rev
2. S08E02Nazi Crop CirclesSeptember 3, 2020 8.6Crop circles spotted on an island in the Mediterranean might not be from aliens, but from a threat closer to home: Nazis; new discoveries he
3. S08E03Island of the Alien OozeSeptember 10, 2020 8.6Satellite images capture a volcanic island that suddenly appears in the Pacific Ocean. When NASA scientists arrive to investigate, they are
4. S08E04Chinese Nuclear PyramidSeptember 17, 2020 8.5Satellite images capture evidence of a mythical lost pyramid in China that's been hidden for centuries, and experts suspect it could be just
5. S08E05Season's bestAmericas' Lost RomansSeptember 24, 2020 9.0The remains of an abandoned settlement high in the mountains of Peru could be an ancient Roman village, leaving experts to speculate if the
6. S08E06The Damned of Devil's IslandOctober 1, 2020 9.0Mysterious satellite images lead an archaeologist to investigate a cemetery on Devil's Island, the notorious penal colony in the tropics of
7. S08E07Nazi Occult TempleOctober 8, 2020 9.0Satellites capture a temple-like, Nazi structure hidden deep in the forests of Poland, leading an expert to investigate and uncover a tale o
8. S08E08Enigmas of Area 51October 15, 2020 8.5Satellites capture two strange patterns in the desert, and they are right next to Area 51; experts use cutting-edge science and new revelati
9. S08E09Curse of King ArthurOctober 22, 2020 9.0When satellites spot a strange, 2,000-year-old structure in Wales, some suspect a secret connection to King Arthur; using modern-day technol

Season 8 ranked & reviewed

1. S09E01Season's bestCurse of the Amazon NazisMarch 11, 2021 8.5When investigators spot strange anomalies in the Amazon jungle, the discovery stokes rumors of a long-lost Nazi base in the Americas.
2. S09E02Epstein's Forbidden TempleMarch 18, 2021 8.5Satellite evidence of a strange building on a mysterious island owned by Jeffrey Epstein points to something sinister; experts use cutting-e
3. S09E03Aztec Alien MysteryMarch 25, 2021 8.5When satellite images spot a strange white substance in the land of the Aztecs, experts investigate the site for extraterrestrial connection
4. S09E04Gate to the Viking GodsApril 1, 2021 8.5New evidence reveals dozens of bizarre circular structures buried in the remote hills of Norway; an expert investigation uncovers a mysterio
5. S09E05America's Swamp CastleApril 8, 2021 8.5Satellite images capture bizarre structures in the remote and inhospitable swamplands of Louisiana; experts investigate a forgotten war-torn
6. S09E06Lost City of the VampiresApril 15, 2021 7.7Satellite images reveal a long-lost village buried in a dense forest; archaeologists investigate and uncover a mysterious gravesite with the
7. S09E07Temple of the Island EaterApril 22, 2021 8.5Satellites capture evidence of a mysterious structure in a remote and rocky area of Hawaii, and when experts investigate, what they find cou
8. S09E08Horror of Dead Man's IslandApril 29, 2021 8.5When a gigantic ship emerges from the sands of a strange island, experts investigate; what they find reveals evidence of a horrific Viking m
9. S09E09Stalin's Secret AtlantisMay 6, 2021 8.5When experts spot what appears to be an abandoned city in the Caspian Sea, they investigate declassified Cold War evidence to reveal an Atla
10. S09E10America's Secret ApocalypseMay 13, 2021 8.5Satellite images reveal a mysterious pattern of six perfect circles hidden in the desert landscape of New Mexico; experts investigate and un

Season 9 ranked & reviewed

1. S10E01Australia's Nuclear DesertOctober 24, 2021 8.6Satellite images capture a giant symbol mysteriously carved into the expanse of Australia's Great Victoria Desert; an investigation reveals
2. S10E02Dark Mysteries of HalloweenOctober 26, 2021 8.5Satellite images capture unsettling evidence behind zombie graveyards, enigmatic ghost towns, and unexplained death cults; experts use cutti
3. S10E03Viking Warrior InvasionOctober 31, 2021 8.5Satellite images capture bizarre groups of circular structures in the remote forests of Derbyshire, England; experts investigate and uncover
4. S10E04Mystery of Apache MountainNovember 7, 2021 8.6Satellite images capture mysterious stone structures spread across high elevations of the Arizona mountains; experts investigate and uncover
5. S10E05Hidden Fortress of SecretsNovember 14, 2021 8.6Satellite images capture a strange castle-like structure hidden in Scotland's dense and remote woodlands; expert archaeologists investigate
6. S10E06Code of the Viking WitchNovember 21, 2021 8.6Satellite images capture a bizarre pattern of rocks in the shape of a large fingerprint on a remote Swedish island; experts investigate and
7. S10E07Mystery of the Cursed ForestNovember 28, 2021 8.5Satellite images capture a bizarre pattern of large concentric circles formed in a remote English forest; experts investigate and uncover a
8. S10E08Secrets of the Roman OccultDecember 5, 2021 8.5Aerial drone imaging captures a sophisticated complex of lost, ancient Roman buildings in Yorkshire, England.
9. S10E09Legend of Moonshine ForestDecember 12, 2021 8.6Satellite images capture a gigantic oval among a bizarre grid pattern that's carved into the dense forests of New Jersey; experts investigat
10. S10E10Season's bestNuclear Ghost TownsDecember 19, 2021 9.0Satellite images capture a mysterious collection of sprawling towns that appear to be completely unoccupied in Belarus; experts investigate
11. S10E11Lair of the Living GodDecember 19, 2021 9.0Satellite images capture a bizarre, cone-like structure perched on the summit of a mountain range in Turkey; experts uncover one of the most

Season 10 ranked & reviewed

1. S11E01Season's bestSecret Soviet SpacecraftJune 22, 2022 8.5Satellite images capture a bizarre industrial complex in the remote desert expanse of Kazakhstan. Experts investigate and uncover a massive
2. S11E02Range of Nazi EvilJune 29, 2022 8.5Satellite images capture dozens of perfectly straight parallel lines hidden in the dense Polish woodlands of Silesia. Experts investigate an
3. S11E03Doomsday Lair of GreeceJuly 6, 2022 8.5Satellite images capture bizarre structures fenced within a remote mountaintop complex on the Greek island of Kefalonia. Experts investigate
4. S11E04Mystery of the Welsh MineJuly 13, 2022 8.5Satellite images capture monumental ruins surrounded by bizarre feather-shaped structures on a northern Welsh mountaintop. Experts investiga
5. S11E05Riddle of Sardinia TowerJuly 20, 2022 8.5Satellite images capture a triangular castle-like tower, a Nuraghe, located on the Mediterranean island of Sardinia; experts investigate the
6. S11E06Circles of the High KingsJuly 27, 2022 8.4Satellite images capture the Hill of Tara, two conjoined circular structures embedded in Ireland's lush and rolling landscape. Experts inves
7. S11E07Russia's Lightning LabAugust 3, 2022 8.3Aerial drone imaging captures oddly shaped industrial-sized towers mysteriously situated in a forest clearing near Moscow; experts investiga
8. S11E08Poland's Secret Nazi CompoundAugust 10, 2022 8.5Satellite images capture a series of enormous zigzagging patterns carved into the remote woodlands of Poland; experts investigate a clandest
9. S11E09Holes of Dead Sea DestructionAugust 17, 2022 8.0Aerial drone imaging captures clusters of enormous, perfectly round holes scattered along the coast of the Dead Sea in Israel; experts revea
10. S11E10Ancient Rome's El DoradoAugust 24, 2022 8.0Aerial archaeologists capture bizarre, spider-like markings etched deep into the mountains of Northern Spain; experts investigate an ancient

Season 11 ranked & reviewed

1. S12E01Bullseye in the SkyJanuary 12, 2023 8.3Satellite images capture a bizarre pattern of enormous circular clouds obscuring the Spanish island of La Palma in the eastern Atlantic. Exp
2. S12E02Mystery of the Fallen StarJanuary 19, 2023 8.3Aerial archaeologists use laser imaging to capture a distinct star-shaped pattern carved into the marsh of a Florida swamp; experts investig
3. S12E03Indiana's War FactoryJanuary 26, 2023 8.3Satellite images capture a large compound of abandoned structures overgrown with vegetation in Clark County, Indiana. Experts investigate an
4. S12E04Season's bestTurkey's Lost Terror DomeFebruary 2, 2023 8.5Aerial drone imaging captures a circular man-made structure that appears to be centuries-old in the remote forests of Aydin Province in west
5. S12E05Blood Feud of Gresham CastleFebruary 9, 2023 8.5Satellite images capture a mysterious fortification concealed beneath a patch of woodland in the remote stretches of Norfolk, England. Exper
6. S12E06The Boneyard of ArizonaFebruary 16, 2023 8.5Satellite images capture miles of rusting military aircraft precisely arranged in the vast Arizona desert, over 4000. Experts investigate Ea
7. S12E07Nevada's Mystery MarkingFebruary 23, 2023 8.3Satellite images capture an enormous X shape mysteriously carved with precision in the remote Nevada desert. Experts investigate a military
8. S12E08Ghost Ship of IrelandMarch 2, 2023 8.3A ghost ship appears overnight on the shores of Ireland after a powerful Atlantic cyclone named Storm Dennis in February 2020. The MV Alta w
9. S12E09Secrets of Biosphere 2March 9, 2023 8.3Satellite images capture a mysterious group of pyramid-shaped structures in Arizona's arid, desert landscape. Experts investigate Biosphere
10. S12E10Arctic Hunters of NorwayMarch 16, 2023 8.3Aerial archaeologists capture a series of mysterious dots buried beneath the remote, frozen landscape of Finnmark, Norway. Experts investiga

Season 12 ranked & reviewed