The remains of the castle are alongside the monastery, consisting of only a couple of towers.
The castle’s remains are seen twice in the film. After Constance (Raquel Welch) is freed from imprisonment; from what is, at least from the outside, the Alcazar of Segovia, she is galloped to the ‘convent’ of Uclés.
In the climax of the film, the Musketeers pass the castle in pursuit of Milady and Rochefort (Christopher Lee) and after some elementary besieging, put an end to both of them.