Murallas de Niebla Monument · Niebla, El Condado, Huelva Walled enclosure of Almohad origin, one of the largest and best preserved in Europe, with gates such as those of Sevilla, El Embarcadero, El Agua, El Buey, El Agujero and El Socorro; the whole walled complex has been declared a historic-monumental site since 1982. 1982 Photo: Giel358 (CC BY-SA 4.0) What to see and do in Niebla