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Hidden Fortress of Secrets
What on Earth? - S10 - E4
Satellites capture a castle-like structure hidden in Scottish woodlands.
What on Earth?: Season 10 - 10 Episode s
10x1 - Australia's Nuclear Desert
October 24, 2021
Satellite images capture a giant symbol mysteriously carved into the expanse of Australia's Great Victoria Desert; an investigation reveals a secret nuclear weapons-testing cover-up by the British government with numerous aboriginal casualties.
10x2 - Viking Warrior Invasion
October 31, 2021
Satellites capture bizarre circular structures in the forests of England.
10x3 - Mystery of Apache Mountain
November 7, 2021
Satellites capture mysterious stone objects across the Arizona mountains.
10x4 - Hidden Fortress of Secrets
November 14, 2021
Satellites capture a castle-like structure hidden in Scottish woodlands.
10x5 - Code of the Viking Witch
November 21, 2021
Satellites capture rocks in the shape of a fingerprint on a Swedish island.
10x6 - Mystery of the Cursed Forest
November 28, 2021
Satellites capture a bizarre pattern of circles in a remote English forest.
10x7 - Secrets of the Roman Occult
December 5, 2021
Aerial imaging captures a complex of ancient Roman buildings in Yorkshire.
10x8 - Legend of Moonshine Forest
December 12, 2021
Satellites capture a gigantic oval carved into the forests of New Jersey.
10x9 - Nuclear Ghost Towns
December 19, 2021
Satellites capture a mysterious collection of ghost towns in Belarus.
10x10 - Lair of the Living God
December 19, 2021
Satellites capture a cone-like structure in the mountains of Turkey.
What on Earth?: All seasons
S0: Specials
7 Episode s
S1: Season 1
6 Episode s
S2: Season 2
6 Episode s
S3: Season 3
20 Episode s
S4: Season 4
20 Episode s
S5: Season 5
10 Episode s
S6: Season 6
9 Episode s
S7: Season 7
11 Episode s
S8: Season 8
9 Episode s
S9: Season 9
10 Episode s
S10: Season 10
10 Episode s
S11: Season 11
10 Episode s
S12: Season 12
10 Episode s