A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This legendary city has been a tourist attraction for centuries.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

The hallucinogenic center of the ancient world.

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

A 1950s beatnik coffee house, turned 60s counterculture hotspot, turned modern music venue.

A unique tribute to the millions of animals who served and died for the British military.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A naturally mummified 2,000-year-old man.

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.

The television series' iconic giant foot was borrowed from this classical painting.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

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

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.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.