One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

A book bound in the skin of an infamous criminal, along with countless other specimens.

Commonly acknowledged as the only public monument to the Devil himself.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Beneath the city of Lourdes, France is a massive, concrete church.

This Old Testament garden features 100 plants from biblical times.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

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

A burial ground of rusting metal grave markers.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

The pyramid and dome deep inside the Dzūkija forest are believed to channel divine energy.

This rare collection of human deformities displays fetuses with two faces, one eye, and "mermaid" legs.

A Hungarian pharmacy museum with a box full of mummy powder.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.