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

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The hidden lair of an alchemist rediscovered in a 2002 flood.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

The "Prussian Versailles" that is as glorious today as when it was built.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

“Invented in Key West, Perfected in Brooklyn."

Snack on a partially gestated duck egg.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.