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

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

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.