Inside this building is another country within Rome, a sovereign entity without a physical territory.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

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

The museum houses one of the world's largest collections of glass paperweights.

An authentic Dutch windmill, built in the Netherlands and shipped to Wisconsin.

Millions of years of erosion created the feature for which this rock formation is aptly named.

This tiny home was originally a narrow alleyway.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

A park where people have been going to feed friendly pigeons since the 18th century

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

This colorful gate stands as an entrance to the walled city of Old San Juan.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Morocco's Argania trees are infested with nut-hungry goats.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

A memorial to the monk who set himself on fire to protest the persecution of Buddhists in Vietnam.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This French colonial post office is arguably the grandest in all of Southeast Asia.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.