The ghostly remains of an accidental sea.

An enormous, inside-out glass globe built in 1935.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The world's only museum devoted to the wonders of fluorescence.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A trash dump made beautiful by nature's power.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

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

A snapshot of the city's fascinating voodoo culture.

The world's largest collection of witchcraft regalia.

Remnants of a storybook amusement park hidden behind a strip mall.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

A one-of-a-kind collection of a unique medium.

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A bizarre house filled with an astounding array of collections.

A toxic ghost town sitting atop a massive coal fire.

An eerie, derelict amusement park in Berlin.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A crumbling hospital from the 1850s on Roosevelt Island.

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

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

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