After a fire that burned everything in 1767, the interior design was redone by the designer Ventura Rodriguez, and has remained the same to this day. The exterior is the only part remaining of the original building.
In the monastery is a museum with interesting paintings and statues, that were given as gifts by the kings of Spain. The entrance to the museum is located in the left wing, and can be easily missed if you do not know to look for it.
Enter the museum and you can see the collections of paintings, belonging to the School of Madrid from the 17th century. Very interesting paints here by Van der Mueulen and Ribera.