When a sinister cave is discovered in a remote corner of Iceland, experts uncover a secret underworld tunneling to unknown depths, and using cutting-edge tech, they investigate if this strange place could hold secrets of alien worlds.

When a strange structure is discovered in the Gobi Desert, experts investigate if this mysterious site could reveal the whereabouts of lost treasure, which might change everything we know about Genghis Khan and the Mongol warriors who once lived here.