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

The celebrated eyesore created by starry-eyed sweethearts.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

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

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

This demon atop the Notre-Dame de Paris looks utterly bored.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Paris' linguistic guide to the international language of, yes, love.

One of Jeff Koons’s largest sculptures and his first commemorative work.

The curious underground history of keeping Paris clean.

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

This monumental mural crafted nearly 40 years ago is still in perfect condition.

Striking, enormous gold-plated sculpture of Buddha installed in the 19th century.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

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

Floating swimming pool within a moored vessel.

The stunning interior of this Gothic church is covered in ornate gold details.

Construction of this bridge was once described as an "act of violence" against a neighboring country.

The local club's soccer field is practically surrounded by UNESCO-protected monuments.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Piran’s oldest square is laden with history and a beautiful 18th-century reservoir.

This lush, scenic spot was carved by the turquoise waters of the Radovna.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

A network of tunnels connecting Bosnia’s ‘ancient pyramids’—or maybe just an abandoned mine?