Erotic art covers the walls of the largest ancient pleasure palace.

The Last Home of an Executed King.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

The atmospheric road was never meant to be so creepy.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Northern Ireland's Brobdingnagian stepping stones.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

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

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

These fantastically named natural pools look like something out of a Scottish myth.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

These crude contraptions were used to aid in the mining of lead, silver and gold.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

Eyam took steps to quarantine themselves and keep the plague from spreading.

Seat of the Duke and Duchess of Devonshire for centuries.

The view from this giant Stone Age toad is unexpectedly beautiful.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

This folly built to commemorate an aristocratic victory over Catholic rebellion plays tricks on the eye.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.