Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

The largest collection of death masks in Ukraine.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

When you've got to go, you've got to go.

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

This tiny museum's sizable collection is jammed into a former underground public toilet.

Monument to a suicide protesting the Soviet invasion.

Walk through Czech history in Prague's largest graveyard.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The cedar tree in Highgate Cemetery earned its title by accident.