Castillo de Sancti Petri Monument · San Fernando, Bahía de Cádiz, Cádiz A fortress located on a small islet at the mouth of the Sancti Petri channel, at the site where tradition places the legendary Phoenician temple of Hercules Gaditanus. Photo: Liki Fumei from Gijón-Asturias, España (CC BY-SA 2.0) What to see and do in San Fernando