Mysteries of the Abandoned Episodes
Season 4, Episode 1
Of Secrets and Cover-Ups
New discoveries reveal how a variety of mysterious deserted engineering projects were built and why they were abandoned. Later, experts reveal a possible cover-up attempt of what really happened on a strange, desolate island near Greece.
Season 4, Episode 2
Curse of the Castle
Experts investigate the demise of historically flourishing communities -- Pablo Escobar's sprawling compound, an elaborate fairy tale estate and a deserted city that was once home to thousands. Eerie revelations and new discoveries reveal the reasons behind such dramatic declines.
Season 4, Episode 3
Wonders of the Underworld
New discoveries reveal various deserted, underworld engineering projects -- from a terrifying sea fortress to a strange complex of towers in a forest of ice. Experts explain why they were built and why they were eventually abandoned.
Season 4, Episode 5
Left Behind
A haunted prison once housed America's most notorious criminals, but now holds only ghostly secrets. New discoveries at the ruins of a massive industrial operation and at an island's abandoned complex reveal dark and gruesome histories.
Season 4, Episode 13
Mystery of the American West
Mysteries are revealed about an abandoned Amazonian prison where criminals faced hard labor and a strange underground complex of tunnels under a mysterious mansion. Also, new discoveries may finally reveal hidden treasure in an American West ghost town.