A museum marks and documents the site of the Titanic's launch.

A circle stone within a stone circle.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A million and a half tons of earth were used to create one of the world's largest land sculptures.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

This enchanting hill is home to fairy lore and a sinister local mystery.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

In 1943 the British military took control of this village, telling residents they had to leave temporarily. The villagers were never allowed to return.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

Scotland's only funicular railway is also the United Kingdom's highest.

Even after the church tried to wipe the practice out, this pagan festival lives on each year in a small Scottish village.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

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