Watchtower of Beniesma Monument · Moncofa, La Plana Baixa, Castellón The Beniesma Watchtower was built before the expulsion of the Moriscos in 1609, in the seafront district of El Grao in Moncofa (La Plana Baixa, Castellón), next to Beniesma beach, as part of the municipality's coastal defence system. Vineyards and pear trees once separated it from the sea, but the rise in sea level has gradually swallowed up the building over the years. The town council demolished the stretch of wall that was still standing due to the risk of collapse, so that today only the foundations are preserved underwater, visible as submerged remains off the coast. Photo: Ripoll531 (CC BY-SA 4.0) What to see and do in Moncofa