Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

Built to hold the worst of the worst of the Nazi war prisoners.

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

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

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

Britain's only herd of free-ranging reindeer.

Scotland's only funicular railway is also the United Kingdom's highest.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

This brilliant display of whirling fireballs celebrates Hogmanay.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Its diverse collection of computers and technology spans the ages.

Russia's giant concrete QWERTY keyboard is likely the largest in the world.

This museum preserves over-the-top masterpieces that once qualified artisans for membership into a medieval guild.

In the Scottish Highlands, this 13th-century castle ruin is hidden at the end of a farm track.

Some 20,000 dust-covered unwanted vehicles languish in the desert.

Things aren't quite what they seem at this mind-bending museum.

Two gems of Beaux Arts architecture that have been sitting vacant for years.

This general store is more than a century old and home to various oddities and antiques.

Thousands of tiny squares in different colors make up this piece of street art.

A cult archaeology conspiracy theory claims these West Virginia petroglyphs were written by Irish monks in Ogham.

Time travel with sweets across history at this research-based candy store.

An abandoned coal mine reached by a steep hike.

10,500 square feet of pinball housed in former dollar store and home to the last playable "Thunderball."

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.