This historic, palatial theater is now one of the world’s most beautiful bookstores.

Constructed on the ruins of a convent, this tower saved countless lives.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

This historic stadium was built to host the first-ever FIFA World Cup.

The remains of Uruguayan hero José Artigas lie beneath a monument in Montevideo’s main square.

Where sweethearts leave their love locks in the Uruguayan capital.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

The pockmarks across the building's facade are remnants of the Blitz.

The commemorative stone column conceals a secret laboratory.

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

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

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

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

Dictionary Johnson’s favorite feline.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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.

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

Eighty million natural history specimens call this gargantuan museum home.

An unusual round church in London with a Templar past.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

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

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.