Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

This stone throne invites adventurers to observe breathtaking views of the Peak District.

An oasis of calm, nestled in the English countryside.

Fantastically decorated underground chambers built in the 1760s.

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

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

The remains of the great moral philosopher reside in a university in London.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The star-studded street honors the city's most notable Brummies.

This lone tower casts an outstretched shadow over the site of a once-wealthy Knights Templar preceptory.

The centuries-old obelisk may have inspired J. R. R. Tolkien.

In a sleepy village in Oxfordshire, the visionary English writer's gravesite attracts a yearly pilgrimage.

Puzzles within puzzles hide a golden treasure in this hedge maze.

The largest known medieval map of the world.

Rare collection of medieval books under lock and key.

Detailed sandstone carvings show an array of symbolism and adorable animals.

Beasts and branches swirl in sandstone carvings, interrupted by one strange creature.

Legend says this demonic carving inside a medieval cathedral was one of Satan's minions.

These carved medieval "mercy seats" are among the finest in the world.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

Catacombs turned marketplace.

Largest lake in Great Britain measured by surface area.