Carlos Olmo
Built in 1883 by Piacentini
The museum is free to enter, the downside is that it's closed in summer and from September the hours are Tue, Wed, Thurs: 10:00-20:00, Fri/Sat: 10.00-22.30, Sun: 10.00-20.00 and closed Monday. It houses interesting exhibitions and is 10,000 m2 on 3 levels: One level for large expos, one for photography and modern art and the last for contemporary art. It was built in 1883 by Piacentini.