A secluded green oasis amidst the towering skyscrapers, bears an unusual moniker that reflects one of the city's oldest guilds.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

The ruins of a monastery that dates to the 7th century.

The ghost town where the villagers refuse to leave.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

A haunting collection of the vanished and disappearing natural world.

This museum houses an imposing skeleton army comprised of creatures great and small.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

London's smallest police station is barely the size of a phone booth.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.