A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The largest single concentration of harmless garter snakes in the world is a writhing Canadian serpent orgy.

Historic psychiatric asylum and most-filmed location in the Great White North.

The ghostly remains of what was once the world's richest copper mine.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

The remains of diamond fever taken over by the desert.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

This replica Viking village was created for a film that was never shot and is now open to visitors.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

An unexpected desert oasis in South America.

A market for witches is hidden within a train station.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.

A neo-Gothic castle in the Argentinian countryside.

An abandoned water sports stadium that has become a haven for graffiti and decay.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Four-story concrete hotel never opened to customers.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.