Human-made caves excavated to hide a secret society of wealthy pagans.

The most loyal of little dogs, or a Victorian era publicity stunt?

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Stonehenge has nothing on Castlerigg’s views.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

England's most notorious suicide spot.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

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

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

Follow the original medieval paths that wind through this intriguing section of the city.

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

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

One of the oldest and certainly best preserved Cistercian abbeys still in existence.