The abandoned ruins of a beautiful medieval castle just outside Barcelona.

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

Village situated on a narrow volcanic escarpment.

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

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

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

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The first mosque in the world to receive electricity.