A circle stone within a stone circle.

These ornate arches show how the course of the River Thames has changed.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

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

The ritual has been performed uninterrupted for nearly 700 years.

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

England's most notorious suicide spot.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

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

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

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

Fascinating town where normal life interfaces with the occult.

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

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

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

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

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

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

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

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

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