A wall of chewing gum moonlights as collective art.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

The statue honors a beloved bird that once roamed St. George's Market.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

It's said this was once the home of King James V's pet lion.

Stay in the one time home to one of Scotland's most notorious gentleman's sex clubs.

A remarkable feat of Victorian engineering across the Firth of Forth.

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

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A sweet symbol marks the place where torturous executions were once carried out.

The tallest mountain in mainland Netherlands isn't actually very tall.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The 20-mile causeway that separates the Netherlands from the sea.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

A rare double mill nestled along the banks of the Aa river.

Europe's first floating restaurant is home to a hilarious legend.

One of Ireland's most infamous prisons for rebels including men, women and children.

Horse cemetery on the grounds of Blarney Castle.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

This single room has survived the centuries with almost no deterioration.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

An unusual manor of stunning beauty, born out of a crippling disease.

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