This artificial archipelago was supposed to resemble a map of the world.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

Longest fortress system anywhere in Europe.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

An ancient knight and a symbol of the city's freedom.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Eighty million natural history specimens call this gargantuan museum home.

Banksy gives themself artistic license with this piece of London street art.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The best place in the world to buy tinned fish.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

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

Elaborate tile work in this railway station tells the story of Portugal.

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

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

The most visited, and possibly most controversial, museum in Germany.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.