Man-made islands are spotted near a North Korean missile facility; an unexpected find in a remote desert leads experts to a lost city of giants; a strange discovery in Siberia suggests a secret mission to the center of the Earth.

An abandoned city in the African jungle may be haunted by the malevolent spirits of cannibals; Mount Vesuvius shows signs of an awakening, and the mafia could be to blame; experts investigate Adolf Hitler's secret Nazi UFO program.