A former execution site with ornate rock carvings of mysterious origin.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

Built on the foundations of an ancient Roman villa, the unique architecture of this castle on the Catalan coast was used as a set for 'Game of Thrones.'

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

This fascinating abbey is considered the oldest monastery in the region.

The home where the famous astrologer wrote some of his most telling prophecies.

A reconstruction of a classic mansion on the island of Delos was designed for a historian and archaeologist.

A long strip of fossil-filled limestone makes up this natural bridge above a rushing stream.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.

This network of roads is one of the most unique Etruscan creations ever discovered.

A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.