Gandía, ES
This ruined hilltop fortress was probably originally established by the Romans; the current structure dates to the Moorish period. In 1097 it was the site of a battle between the Almoravids and El Cid, and in 1240 it came under Christian control. The castle can be accessed by an easy hike of just ov
er 1km, and has great views of the sea and the surrounding countryside.
Listen to the audio guide for Castillo de Bayrén Free on WIP — starts by itself when you arrive, even with the screen off