Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

This Belgian theme park began as a refuge for bored church children and was closed down when a boy lost an arm.

The foundations of a forgotten fortress, wedged in between two streams.

After the construction of a nearby cathedral obstructed the view, the oldest belfry in Belgium was more than doubled in height.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

A moving memorial to the fallen and missing from WWI trenches.

A visionary precursor to the Internet made of index cards.

Dummies recreate radiological discoveries from history.

This bike path traverses the treetops.

When you're a great Russian Tsar, even your vomit gets a statue.

A rare example of World War I trenches from the British front.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

A corkscrew-shaped barn in Ireland.

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

The longest and tallest aqueduct in Britain can actually be sailed across.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

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

A pagan tradition of draping trees with rags eerily lives on.