Castle of Molina de Aragón Monument · Molina de Aragón, Señorío de Molina, Guadalajara The castle of Molina de Aragón, which overlooks the town from an ancient Celtiberian settlement, originated as an Andalusi alcázar in the 10th-11th centuries and was conquered and rebuilt in 1129 by Alfonso I of Aragon. With a perimeter of 800 metres, it has two defensive enclosures: the inner one once had eight towers, of which remains of two are preserved and another four stand in good condition, along with crenellated walls with a wall-walk, five access gates and the church of Santa María del Collado. Declared Monumento Nacional (Spain's highest level of heritage protection) on 3 June 1931, it is today visited in a state of consolidated ruin. Photo: Diego Delso (CC BY-SA 4.0) What to see and do in Molina de Aragón