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

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

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

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

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The heads of two giant mythological water horses honor Scotland's horselord past.

Where condemned pirates met their grisly end at the gallows on the River Thames.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

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

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

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

A fantastic castle rumored to be the birthplace of King Arthur.

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

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

London's smallest police station is barely the size of a phone booth.

Northern Ireland's Brobdingnagian stepping stones.

Hear the quietest sound from across the dome.

The final resting place to 300 Victorian-era pets hides inside the city park.

Famously misunderstood wonder of the ancient world

The sign at the garden gate reads: “These Plants Can Kill.”

One part local history, 99 parts gruesome haunted house.

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