Ermita de Nuestra Señora de los Reyes Monument · Castellar de la Frontera, Campo de Gibraltar, Cádiz Image of Castellar de la Frontera, not of the place itself. A chapel in Castellar de la Frontera dated to 1562, one of the oldest surviving religious buildings in the municipality. 1562 Photo: Luis Rogelio HM (CC BY-SA 2.0) What to see and do in Castellar de la Frontera