Where sweethearts leave their love locks in the Uruguayan capital.

A modern reimagining of a medieval city gate.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

Quito's historic, main square dates back to the 16th century.

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

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A nearly 25-foot concrete sculpture of Sylvette, Picasso's muse.

Traditional architecture and ancient irrigation systems are on display in this gorgeous mountain village.

Four giant movable street lights decorate this modern Rotterdam square.

The longest and widest floating bridge in the world.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The New Central Library is a masterpiece of contemporary architecture in the midst of downtown Calgary.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

The world's largest frame offers spectacular views of the city's past and present.

With its webbed walls and bright red coloring, Calgary's iconic bridge looks like a finger trap puzzle stretched across the river.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

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

Every year, the colorful murals of Montreal get a complete makeover.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.