This temple stands out as much for its architecture, a beautiful example of the late Gothic, as for the works of art that it contains. Our Lady of the Assumption was apparently built on the site of an earlier one in which, according to the chronicles, Queen Isabel la Catolica prayed and heard Mass in 1475. The primitive building would not respond to the needs of the growing population, so it became necessary a new temple, which rose under the patronage of the Mendoza, gentlemen of the Real de Manzanares, of which Colmenar Viejo was its most popular place. The most important artistic ensemble is the main altarpiece that took place between 1560 and 1584 and is framed within the Plateresque Renaissance, with the intervention of Alonso Sánchez Coello and Francisco Giralte, among others. It emphasizes the figure of the Virgin Mary as well as its tower, to the feet of the church, with a height of about 50 meters.