A church filled with the bones of hundreds of virgins martyrs—or so they say.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

A 12th-century fortress containing some of Berlin's oldest buildings.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A surreal museum of extraordinary industrial objects.

Started as a kitchen garden, now the second largest botanical garden in the world.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

A kaleidoscopic warehouse-maze of handmade neon signs.

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

You can climb to the top of the column built to honor the "father of British inland navigation."

Each spring this woodland floor is carpeted with purplish flowers as far as the eye can see.

This ancient Bedfordshire church was abandoned when the village's population slowly began migrating to new towns.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

A garden in Lisbon filled with giant porcelain creatures.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The oldest residential street in Europe also features an optical illusion.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A small alleyway with an unusual moniker.

A bench and a bridge pay tribute to Birmingham's favorite heavy metal band.