It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

This bookstore serves recipes from the cookbooks on sale.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A open air theatre built on a cliff by an eccentric British woman.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Arthur, Merlin, and Guinevere are among the largest and oldest satellite dishes on the planet.

A giant bird sits atop a tower at one of the largest shopping centers in Brazil.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

A hidden gem in the middle of the city's infamous Jewelry Quarter.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

A winding cave grotto walkway built to provide employment for veterans after World War I.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Five candy-colored villages on the Italian Riviera.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

This small red school was where Germany signed their surrender during WWII.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.