Now nearly dry, this lake is said to be the ancient home of the Lady of the Lake, and was once thought to be bottomless.

This antique prison is a tourist attraction with a sordid past.

A fantastic castle rumored to be the birthplace of King Arthur.

A deadly ancient portal to the underworld.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

Dilapidated ruins that once treated a notorious young serial killer, currently hosting vandals, squatters, and ghost hunters.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A museum to a cave explorer whose tragic death was a media sensation, and whose corpse became a tourist attraction.

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

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Cryptic messages embedded in the New York City sidewalk.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

One of the largest remaining ancient burial mounds of the 10th century.

A tomb with a window to ensure the interred wasn't buried alive.

Structure built from the skulls of vanquished foes.

Museum about life, death, and cannibalism in the Stone Age.

Mexico's astounding mummy museum with "the world's smallest mummy."

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

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

The sanctuary holds what was once believed to be the saint's incorruptible tongue.

Mummified monks and the accidentally interred, in a 17th-century crypt.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.