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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

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

An ancient Egyptian temple in the middle of Madrid, Spain.

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

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!