Rome's semi-secret peephole vista is also a former Crusader stronghold.

The oldest residential street in Europe also features an optical illusion.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

Where condemned pirates met their grisly end at the gallows on the River Thames.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

During World War II, the Nazis repurposed this beer cellar to store stolen artwork.

This bridge is haunted by the ghost of a distraught mother.

A legend says that if this elaborately decorated glass breaks, the good fortune of its owner's household will also disappear.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

Most prolific publishing house in the 1600s open to the public.

An open-air sewer system that was covered piece-by-piece over 300 years.

According to this bar, God gave an “11th commandment” to Antwerp: Thou shalt drink beer.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

The famous author's cottage hideaway.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A "miracle" that seems to produce more holy fistfights than holy revelations.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

This overlooked street light once served as a KGB dead letter box.

This old-school café is famous for serving coffee, chilaquiles, and the Cuban Revolution.

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.