The Tübingen University anatomical collection hosts an example of an extremely rare medical phenomenon.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

An ancient burial ground believed to have been used for ritual sacrifice.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

Flames have been burning within this mountain for more than 2,500 years.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

In this truly magical place, rent hasn't been raised since the year 1520.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A collection of human remains, animal body parts, and other macabre curiosities all legally for sale.

The world's only pure blue lizard lives exclusively on this secluded tropical island.

An elevator into the Baltic Sea.

The first (but not only) upside-down house in Germany.

A forsaken beachfront condo abandoned after the Boxing Day Tsunami.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.