Wall of Peníscola Monument · Peníscola, El Baix Maestrat, Castellón Renaissance walled enclosure of the old town of Peníscola, the work of Felipe II's military engineer Giovanni Battista Antonelli, completed in 1578 to defend the stronghold against Barbary piracy; its layout recalls the walls of Ibiza. Photo: Enric (CC BY-SA 4.0) What to see and do in Peníscola