A clock designed to run with perfect accuracy for 10,000 years.

A relic from one of London's worst 19th-century slums.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This iconic high-rise residential block was one of the last to be built in the Brutalist style.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

This 11th century tower is said to be the oldest building in Oxford.

The beautiful non-repeating pattern honors the Oxford professor who discovered it.

A hidden plaque is the only reminder of the lost palace where two storied English kings were born.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

One of Oxford's greatest treasures likely belonged to the legendary King Alfred the Great.

The lantern carried by the infamous Guy Fawkes when he was arrested while attempting to blow the houses of Parliament and the King of England to smithereens

Used as an example in one of the first dictionary entries for "museum" in 1706.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

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

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

This London marker celebrates the spot where the world-famous English band was founded.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Eighty million natural history specimens call this gargantuan museum home.

A legend says that if this elaborately decorated glass breaks, the good fortune of its owner's household will also disappear.

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

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