Terrifically morbid cemetary and site of famous Paracelsus' grave.

Venice's "Island of the Mad."

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

A 131-year-old wunderkammer of Texas history.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Lemon Grove, California is known for its giant lemon...and mummified bodies.

This once luxurious Catskills resort is now a haunting ruin.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

The famous author's cottage hideaway.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This massive subterranean fissure is known as the "underground Grand Canyon."

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

A museum in the childhood house of a medical pioneer.

Two stunning 17th-century libraries and a cabinet of curiosities.