This waterfall is one of the most spectacular natural features in the Scottish Lowlands.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

After years of slow decline, a derelict Gothic castle is now being restored to life.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.

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

A holy well believed to have healing powers.

The remains of centuries of copper mining appear like an alien landscape.

Want to properly offend a king? Sculpt a giant hill figure in chalk of him riding out of town.

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

This trio of neolithic stone monuments are fabled to be a king and his knights that were petrified by a witch.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

These haunting ruins belong to an ancient village that once had one hell of a view.

Legends say that this small island was the final resting place of the Welsh saint of lovers.

The stately remains of Llywelyn the Great's mighty fortress.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

This mysterious hilltop collection of Druid carvings isn't quite what it seems.

This haunting stone chasm is a hotbed of mossy rock and English legend.

Europe's largest prehistoric mound – burial site of a legendary king?

Neolithic burial chambers hidden beside a village school.

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

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.