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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.