Season 4
Episode 1:
World's Strangest Ghost Towns
Episode 2:
Secret of Supervillain Island
Episode 3:
Escobar's Castle
Episode 4:
Labyrinth of the Dead
Episode 5:
Treasure of Outlaw Valley
Episode 6:
Alaska's Fort Apocalypse
Episode 7:
Alien Hell Portal
Episode 8:
Pompeii's Gate To Hell
Episode 9:
Haunting on Plague Island
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Mysteries of the Abandoned
Overview:
Documentary series investigating why some of the world's most advanced architectural achievements were abandoned.
First Air Date: 2017-04-20
Genre:
Seasons: 13
Episodes: 140
Episode Duration: 42 min
Status: Returning Series
Production: Travel Channel
