Cave of l'Artiga Nature · Costur, L'Alcalatén, Castellón Image of Costur, not of the place itself. Cave of Costur with well-preserved stalactites and stalagmites, near the Cabezo, the highest point in the municipality with views of Peñagolosa. Caving can be practiced there, one of the activities offered by this site within the municipal boundaries. Photo: Millars (CC BY-SA 3.0) What to see and do in Costur