6 Seasons
S2 E4
9/6/19
Alien Fortress
Alien shrine, a bridge in the wilderness, a castle with a secret. A sea fortress, a highway in the Amazon and a mysterious structure by the Statue of Liberty are engineering projects, and new discoveries reveal how they were built and why they were abandoned.
The Latest
Seasons
Episode
1
Armageddon Highway
Episode
2
Curse of the Haunted Prison
Episode
3
Arctic Hell Pit
Episode
4
Desert Ghost Fort
Episode
5
Conspiracy on Devil's Mountain
Episode
6
Secrets of the Alien Shrine
Episode
7
Amazon Ghost Town
Episode
8
Sea Fortress of Doom
Episode
101