The Castle of Sierro dates from the pre-Islamic era and was built, like most of the castles of Almeria, for defensive purposes, and to be able to repel any attempt of invasion or taking of the town - especially during the time of the harvests, when the war incursions increased to steal food.
This castle has undergone a reconstruction process, during which they have found samples of ancient pottery, as well as other elements that attest to the long history of the castle.
Among the findings are coins, iron slags, weapons and lead, all related to the date on which the castle is asummed to be operative. In the castle there are also the remains of a cistern, the walls, the tower and a cemetery.
It is of great historical, architectural and cultural value, for it has been declared a Protected Heritage.