Famously misunderstood wonder of the ancient world

Breathtaking and huge 430 year old maps of Italy.

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

A curious memento mori hangs in the magnificent Cathedral of Segovia.

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.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A beautiful but toxic fountain of mercury.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Intricate wood carvings on an island in Siberia.

Russia's own leaning tower was built on a tragic historical fable.

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Gargantuan home of Russian science.

This massive glowering Lenin head gazes out over eastern Siberia.

This nostalgic Russian museum is full of USSR cultural artifacts from the 1970s and 80s.

Church built on the site where the last tsar of Russia and his family were killed.