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Season 12 Episode
- Season 12 Bullseye in the Sky
- Season 12 Mystery of the Fallen Star
- Season 12 Indiana's War Factory
- Season 12 Turkey's Lost Terror Dome
- Season 12 Blood Feud of Gresham Castle
- Season 12 The Boneyard of Arizona
- Season 12 Nevada's Mystery Marking
- Season 12 Ghost Ship of Ireland
- Season 12 Secrets of Biosphere 2
- Season 12 Arctic Hunters of Norway
What on Earth? - Season 12 Episode 7 Nevada's Mystery Marking
6.50 44 minutes Satellite images capture an enormous X shape mysteriously carved with precision in the remote Nevada desert; experts investigate a military emergency landing field linked to one of the most astonishing test programs in aviation history.
