A strange structure is found in Mongolia - is it the lost tomb of Genghis Khan? Plus, bizarre rings in Spain could lead to the lost city of Atlantis. S2/Ep6
The face of Christ is found in a field in Hungary, and a sinister shape in the mountains of Afghanistan leads investigators to a hidden genocide. S2/Ep5
Satellites discover American stealth technology deep inside China, and an unidentified cloud swamps America's skies. Just what on earth are they? S2/Ep2
Satellites spot spiral markings in the remote African desert, and a weird deadly black blob is threatening the Florida Keys. Just what on earth are they? S2/Ep1
A young boy makes headlines when he uses satellite images to discover lost cities of the Maya. Trees in China seem to spell out a sinister message. S3/Ep19
Images of the jungles of Colombia lead scientists on a search for El Dorado. And, a bright green swirling spiral appears in the seas of the Persian Gulf. S3/Ep17
New evidence may lead to the discovery of an unknown ancient civilisation in the Amazon rainforest. A strange submarine is seen in a North Korean shipyard. S3/Ep15
A strange mass breaches the ocean surface near Antarctica - is it a sea monster? Ancient rock carvings in a remote mountain range depict unearthly beings. S3/Ep12
A dagger sealed in King Tut's tomb for over 3,000 years is made of a possibly extra-terrestrial metal. A huge swastika is found in the desert near Roswell. S3/Ep11
A giant letter Z is carved into a Mexican hillside, evoking the mark of a legendary outlaw. Plus, a strange sighting in Germany points to secrets from the Cold War. S3/Ep9
Satellite images reveal how El Chapo escaped from a high security prison in Mexico. Plus, a giant black stain appears in a war-torn area of Iraq. S3/Ep8
A sinister giant swastika appears in a forest in Germany. Plus, mysterious markings are spotted in an isolated corner of Antarctica - how did they get there? S3/Ep7
A buried monument offers new evidence about a huge Biblical mystery. A giant shadow engulfs the Pacific Ocean, and strange circular lake is home to unearthly life. S3/Ep6
Strange black holes appear near Egypt's pyramids, ruins in Peru suggest the Incas knew more than expected and a mysterious red swarm invades a beach in India. S3/Ep4
Strange spots near the Grand Canyon may lead to the legendary treasure of a notorious bandit. Plus a massive chunk of ice disappears in Antarctica. S3/Ep3