The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One English town's celebratory landmark spurred more trouble than anticipated.

One of England's most famous churches hides a pair of little known architectural treasures.

Vast fan-shaped British cemetery honouring American servicemen lost in World War II.

Monument to a suicide protesting the Soviet invasion.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This automated sculpture of two men peeing will spell out text messages with their micturition.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This one has sailed five times as far as Sir Francis Drake's famous ship.