Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

When you're a great Russian Tsar, even your vomit gets a statue.

This modern arts center is built around a gem of late-Baroque architecture.

A once-secret library of Freemason history in Catalonia.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

This cemetery features modernist statues as strange as its name.

This semi-secret storybook hedge maze is also the oldest garden in the city.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Mountain where Jesus was first tempted by the Devil.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.