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

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

Dedicated to this region's early settlements and rich history of salt mining.

The world's oldest known salt mine.

An Austrian house of bones filled with hundreds of intricately painted skulls.

One of the oldest hospitals in the Americas is now decorated in hallucinatory murals.

For decades, the parade of apostles that left the Expiatory Temple of Guadalajara remained hidden inside one of the towers.

This structure was moved nearly 40 feet while people continued working inside it.

This historic cemetery built for victims of the epidemics that swept Guadalajara is shrouded in macabre tales.