A carousel trades in its classic horses and calliope for endangered species, native flora and fauna, and a modern soundtrack.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

France's most famous cemetery, with some of its most curious tombs.

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

Notorious artist squat renovated into legal studios.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

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

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

This German bone house contains the remains of some 20,000 souls.

Northern Ireland's Brobdingnagian stepping stones.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Abandoned railway line circling the city of Paris.

Volunteer-run library dedicated to exploring five decades of activism history.

The world's largest reflecting pool is just two centimeters deep.

In paradise, feral pigs have claimed an island all to themselves.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

This blowhole is supposedly caused by a trapped monster.

This former luxury resort in Kaua'i is now an abandoned relic.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

Race through the maze, get your name on the sign.

A Hawaiian stairway to heaven—that you can't climb.