Every equinox this Maya pyramid puts on a spooky ancient light show.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The curious underground history of keeping Paris clean.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

This Himalayan airport provides one of the most difficult landings in the world.

A museum dedicated to exhibiting remarkable outsider art.

The Voodoo Superstore of the world.

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

Outsider art meets paleontology at this roadside reptile repository.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an eighth-century Buddhist master.

Museum preserving torture methods from the past.

Thousands of costumed dolls fill one of the world's creepiest museums.