A rare example of an octagonal Catholic church.

The prototype for all Nazi concentration camps.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A little sculpture with a large wardrobe.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

Go inside to really appreciate this 500-year-old technological masterpiece.

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

There has been an astronomical clock on this spot since the 14th century.

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

This unusual piece of Renaissance art depicting the bodily horror of crucifixion and skin disease may have been inspired by fungus-induced hallucinations.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A fake medieval village in the middle of Turin.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A mushroom-shaped outcropping that has come to be the symbol for an entire town.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

The only museum with its curator—and her pets—buried inside.

During World War II, this rice mill became a Nazi concentration camp.

The oldest botanical garden in the world that technically isn't the oldest.