This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

A museum which takes visitors to the côté obscure of Paris.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

After years of being casually peed on by humans, this tree is peeing back.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Paris' linguistic guide to the international language of, yes, love.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

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.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

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

A museum wholly devoted to juvenescence.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Tiny castle in the middle of the Rhine made you pay to pass.

Legendary site where an evil bishop was devoured by rodents.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This small chapel is built of human bones and decorated with a golden skeleton.

Dead weights honor the dead of Portugal's fishing industry.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.