A stonemason's hilarious revenge came in the form of this peculiarly positioned gargoyle.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

This Late Gothic building that once housed Erasmus is now known as the filming location of "Suspiria."

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

The great Danube river starts here.

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

Northern Ireland's Brobdingnagian stepping stones.

This World War II relic let Allied pilots know they were entering neutral airspace.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Certain traditions prevail on the least-visited island of the Aran Islands.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

An amazing collection of curiosities hidden in a small Welsh village.

Go deep down into the earth to experience the world of Welsh coal miners.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

A prison with a more than 200-year history.

Believed to be an execution site used by King Arthur after he was embarrassed.

This ancient abbey now lies in majestic ruin behind a caravan park.

Following years of secrecy, the hidden history of a World War II site is being brought to light.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

The ruins of a stone tower with alleged (but unlikely) Roman origins.

This mysterious wheel-cross is the tallest in Britain.

This abandoned asylum in Wales might look haunted, but it's still beautiful.