This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The world's largest collection of witchcraft regalia.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

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

A toxic ghost town sitting atop a massive coal fire.

A fiery crater has been burning in the Karakum Desert since 1971.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Tucked in the back of this amazing antique store is an important piece of medical history.

The sign at the garden gate reads: "These Plants Can Kill."

A crumbling hospital from the 1850s on Roosevelt Island.

The fairy tale castle of the "fairy-tale king."

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

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

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

On the Oregon coast there is a natural hole that seems to be draining the sea.

World's largest collection of serial killer artwork and other macabre exhibits.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

World's first "penitentiary," meant to be humane, drove men insane.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Rippling sand dunes frozen in the Arizona rock.