A controversial art piece that harkens back to local folklore.

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

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This haunting location was featured in the final scene of a classic spaghetti western.

The history of this Moorish castle includes royals, a Mexican-Spanish association, and several attempts at lodging.

A somewhat mysterious biomedical museum housed inside a Spanish university.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

Guitarist Paco de Lucía overlooks travelers as they pass through this train station dedicated to his legacy.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

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

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

The morbid items in this small and hidden museum are not for the weak stomached.

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

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

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

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

A 16th-century horror show built in a lovely Italian garden.

The first declared National Monument in the United States.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.