In Spain, the ruins of a Roman military camp sit along a flooded section of a river.

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

A hidden medieval crypt where a famous legend says the devil used to teach black magic.

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

A historic Christian shrine nestled within a spectacular natural cave.

This Bronze Age man spent millennia buried in a mine, giving his bones an eerie hue.

During an annual Catholic feast in this tiny Spanish village, men dressed as devils leap over rows of babies to cleanse them of sin.

The closed and crumbling Francoist luxury resort for workers is still full of life—for now.