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

This Parisian gem is one of the most incredible ethnographic museums in the world.

A subterranean shelter remains intact under a busy Paris railway station.

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

A model solar system adds a celestial touch to this suburban park.

This postmodern apartment block was designed to be a vertical neighborhood.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Commonly acknowledged as the only public monument to the Devil himself.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

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

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

Noirish green neon marks the location of one of the oldest private detective agencies in France.