Season
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 9 Secrets of Biosphere 2
6.20 44 minutes Satellite images capture a mysterious group of pyramid-shaped structures in the arid, desert landscape of Arizona; experts investigate a highly controversial research facility designed to prepare humanity for life on another world.
