A surrealist labyrinth and museum of contemporary sculptures.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

The world's largest wooden structure.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A pair of gigantic baby heads greet passengers at Atocha Station.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

This 47-story "M" needed 20 years to be completed

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

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

A once-secret library of Freemason history in Catalonia.

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

This cafe offers a curated collection of treats and tipples made by monks and nuns.

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

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A stately palace has been converted into the world's largest cannabis museum.

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

Week-long block party becomes a competition for the best decorated street.

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

Turntable anonymously received orphans, alms, and groceries.