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.

This ancient Egyptian obelisk still bears the wounds of World War I.

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

The broken skateboards that became a poignant memorial to a murdered skater.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

After nearly 60 years, there's still a bear at Paddington Station looking for help.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.