The anatomical-pathological collection of a man who changed surgery.

This charming railway is one of the oldest and steepest funiculars in England.

This water-powered cliffside railway is one of the steepest funiculars in the world.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

Climb to the top of this windmill for a scenic panorama and up-close look at wind energy production.

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

Museum about life, death, and cannibalism in the Stone Age.

This century-old, single-screen cinema still puts a 1937 Compton organ to good use.

Built to celebrate the glory of a new queen, this forgotten monument has moved around Madrid three times, reflecting 200 years of political whims and city redevelopment.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

A thorough look at the development and history of the underground's rolling stock of the Madrid subway system.

This 40-meter waterfall of light graces one of the most iconic stations in the Madrid metro network.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

After the queen of Spain had a dream where these statues fell and crushed her, they were removed from the palace and given new homes around Madrid.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The remains of this misplaced church were moved here stone by stone.

Once a resting spot for King Fernando VII.

A haven for book enthusiasts across the street from Retiro Park.