This sprawling, Brutalist estate feels like a city within a city.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

The leathery remains of a woman who died in the 13th century now lie in a church named for her.

This Roman theater was crafted into the local tuff rock and was rediscovered during the 19th-century.

This war memorial commemorates some of the world's first paratroopers.

This fiberglass version of the Awakening sculpture by Seward Johnson, now resides in its third location in Italy, in Viterbo.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Go inside to really appreciate this 500-year-old technological masterpiece.

Rebuilt remains of a temple to Roman god Mithras.

A typographic tribute to the many comedic greats who make Great Britain laugh.

A little slice of Japan and its aesthetics in London's Holland Park.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

The abandoned military base looks like a post-apocalyptic wasteland.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

The remains of a small medieval chapel mark the legendary birthplace of the patron saint of Wales.

This eye-catching roundabout sculpture commemorates one of England's best World War II-era "shadow factories."

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.