William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

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

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

A living memorial to the trees London lost during the Great Storm of 1987.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

This coffee shop lies hidden beneath a historic church.

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.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This London plaque marks the spot where David Bowie's famous alien made his debut.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The bronze uniforms commemorate the vital role of women during World War II.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

This five-star hotel was originally a swanky parking garage.

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

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

The canine-themed book collection claims to be Europe's largest dog library.

The secret wartime bunker built on the platforms of an abandoned Tube station.