A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

A giant bug impaled on a 75-foot-tall needle.

The world's tallest boat lift stands as a massive piece of industrial tourism.

The corpse bride of Portugal.

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

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

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Castro's communist ice cream mothership has been serving five-scoop "salads" for over 50 years.

Neo-cave art on the macro scale.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

The stoutest tree in the world.