Built by Pedro de Ribera in 1717-30 to accommodate the Regiment of the Royal Guard, this building of gigantic proportions (its facade is 250 yards long) was used as a military academy and an astronomical observatory in the 19th century. A fire damaged the upper floors in 1869, and after some decay it was partially renovated and turned into a cultural and arts center. The center features temporary art exhibitions in some of its spaces, including the public and historical libraries. In summer, outdoor concerts are held in the main plaza.
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