A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Museum celebrating the history of computers, especially their role in codebreaking.

Fantastically decorated underground chambers built in the 1760s.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

A museum in the childhood house of a medical pioneer.

The Titanic sails again in one Scotland man's backyard.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

Mysterious painted skulls in Moravia.

The first island in the world designated a light-pollution-free astronomical observation point.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

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

Staves, storm-calling, and of course, necropants.

The world's largest collection of witchcraft regalia.

Enter the cabin of a life-sized Hindenburg replica.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

An unrealized dream to wirelessly electrify the entire Earth.

A reproduction of earth's many biomes.

The deepest hole drilled in the name of science, where evidence of Precambrian life was found.

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

This institution collects the history of burlesque dancing with a titillating collection of ephemera and pasties.

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

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.