This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

It's unclear what caused the fire that led to this opulent hotel's demise.

All that remains of a Japanese fishing vessel that ran aground in 1982.

This cave overlooking the Indian Ocean has been turned into a shelter and makeshift museum.

South Africa's postal service began with a letter left in a boot beneath this tree.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

This foolish Victorian sea fort was converted to a deluxe hotel.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

This charming, hidden guild museum holds some 700 years of crossbow history.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

Lavish royal estate punctuated with heated greenhouses.

A memorial to the only dog ever officially enlisted in the Royal Navy.

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.