Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An architectural oddity hides in plain sight on this iconic London bridge.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

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

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

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

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

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

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

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

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

Hear the quietest sound from across the dome.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.