Mysteries of the Abandoned

The world's strangest ghost towns are home to dark secrets, creepy buildings and eerie sights, and new discoveries reveal why they were abandoned.

On a strange island off the coast of Croatia, the mysterious ruins of a long-abandoned hideout look like they once belonged to a James Bond supervillain, and new discoveries reveal why it was built and why they were abandoned.

The ruins of a once-palatial compound contain the secrets of one of history's most notorious criminals. New discoveries reveal why this high-security estate was built and why it was abandoned.

Tunnels filled with human bones lie beneath the streets of Paris, and this horrifying engineering marvel points to a dark secret. New discoveries reveal why this grisly underground death maze was built, and why it was abandoned.

A ghost town in the American West was once a Gold Rush hot spot and one of the most violent places in the country. Today, there are legends of a secret treasure buried in the hills and new discoveries might reveal its location.

In Alaska, the ruins of a massive compound point to eerie evidence of an apocalyptic mystery. New discoveries reveal why the strange marvel was built in the snowy wilds of the Last Frontier and why it is abandoned.

A strange complex of tunnels on the grounds of a bizarre mansion were under lock-and-key for a century, some believe the mysterious place is a gate to hell. New discoveries reveal its secret purpose and why it was abandoned.

Near the destroyed city of Pompeii, an eerie complex of underground tunnels snake beneath a volcano, and some believe they were intended as a gateway to hell. New discoveries reveal why they were built and why they were abandoned.

A complex of buildings on a remote tropical island was once home to a large seaside community, but today, locals avoid the area and claim it's haunted. New discoveries reveal why this eerie place was built and why it is abandoned.