This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

Over several decades, one of London’s most iconic city gates was dismantled, moved out of the city, and then moved back.

Murals of the wild parties once held on the frozen River Thames.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The ground on which Shakespeare’s initial playhouse once stood.

The London statue that imitates passersby.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A series of markers along one side of an Amsterdam canal memorialize the Jewish residents from the other side who died in the Holocaust.

The mirrored section takes the shape of Hebrew characters when viewed from above.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

The grave of the famous painter is marked by a simple stone in the ground.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

An archway adorned with vulnerable flora and fauna.

The video game-themed street art first popped up in the French city.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

This modest marker near Notre Dame identifies the very center of Paris.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

Brussels' favorite peeing boy has a sister.