The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

The largest greenhouse in the world is home to over one million types of plants.

This 1920s Dutch barge is now a floating bookstore.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Famously misunderstood wonder of the ancient world

This cheese shop also houses a museum devoted to Dutch dairy.

Recently restored menagerie of Victorian-era beasts.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

The castle still holds traces of the abandoned Roman fort it was built atop.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The medieval woodcut-style artwork chronicles life in medieval London.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A hands-off space for graffiti artists to hone and display their skills.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

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

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Be on the lookout for the symbolic insect all over the city.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.