The Reial Monestir de Sant Jeroni de Cotalba sits inland from Gandia, a 14th-century monastery later expanded in Renaissance and Baroque styles. The result is a layered complex rather than a single-period monument, with a Mudejar cloister, church spaces, old monastic rooms, and gardens.
It is privately owned but open to visitors, so check current visiting hours before making the short trip out of town. The monastery works best as a quiet history stop paired with Gandia's Borgia sights.