Abandoned railway line circling the city of Paris.

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

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Make your reservation to have coffee with some kitties.

A natural gas leak provides a flickering flame beneath a waterfall.

A popular swimming hole that hides one of America's most deadly diving spots.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

The largest permanent Monopoly board makes one of the longest games even bigger.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This spectacular track has run continuously since 1882.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

The hottest place on the planet.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

The true depths of these stunning Moroccan caves are unknown.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.