This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Romania's triumphal arch looks out over Bucharest.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This Parisian café sticks almost exclusively to an ethos of reuse.

Notorious artist squat renovated into legal studios.

Brush shoulders with animatronic Arab leaders made of silicone.

This modernist cinema has survived war and reconstruction to become a symbol of Lebanon’s revolutionary spirit.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

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

This towering church is home to a world-famous organ and a treasure trove of medieval art.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

A statue of the second-tallest Dutchman in history.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

Lumps of significant stone from around the world surround a flaming monument for peace.