The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Cemetery featuring rare glass-fronted columbarium.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Eighteen miniature death-scene dioramas.

A tiny metropolis resides inside this student housing complex.

Take an underground boat ride through a former hydraulic raceway that was built in the late 19th century.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

Apartment complexes built into huge repurposed natural gas tanks.

The Hveragerði fissure runs through this unassuming shopping center.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

You can enjoy a (possibly haunted) stay at the medieval Norman castle that was once a favorite hunting lodge of King John.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

A hidden three-foot-wide house separates these two regal churches.

Christ's blood preserved in a Belgian town.

The hallucinogenic center of the ancient world.

European castle ruins in an American state park are actually the product of death and grief.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

One of the most acclaimed eateries in Arkansas is a two-table diner on the ground floor of a family home.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.