Upcoming episodes, programme details and where to watch over the next seven days. All times are UK time.
The Deserted: Explore strongholds abandoned by their architects, look at a lost city in the Amazon jungle and see a desert fortress made by humanity's most notorious empire.
Mysteries Of The Misplaced: Fly over an imperial pyramid in the Netherlands, a metal sphere in Russia, a lion in England and a swath in an Austrian forest.
Ancient Mysteries: Discover familiar stone monoliths in Colombia, explore a lost city in Sierra Nevada and unravel ancient ruins in Greece and Malta.