The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

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

A trash dump made beautiful by nature's power.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

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

A snapshot of the city's fascinating voodoo culture.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

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

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

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

A bizarre house filled with an astounding array of collections.

The rocks in this arid basin leave trails of movement behind them.

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

A church of bones, decorated with 40,000 human skeletons.

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.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A terrific purveyor of natural history objects and curios.

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

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

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

On Japan's Tashirojima Island, cats are king.