Episode Overview
Hidden beneath the ground are ancient tunnels, sacred caves, and mysterious pathways leading to a dark world formed by nature, shaped by human hands, and rich with legend. Are these subterranean spaces simply echoes of a bygone era?
Show Information
Season 7 Episodes 18
1.
The Golden Age of Pirates
2.
Impossible Ancient Inventions
3.
The Lost
4.
Alien Contagion
5.
Ancient Bible Relics
6.
Islands of the Damned
7.
Tales From Antarctica
8.
Robot Revolution
9.
Secret Societies
10.
Secrets of the Spies
11.
Secrets of the Civil War
12.
Mysterious Urban Legends
13.
Mad Scientists
14.
Strange Tales from the American Frontier
15.
Terrors of the Deep
16.
Unlocking the Sixth Sense
17.
The World's Deadliest Assassins
18.
Mysteries of the Underground
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