sightseeing spot downtown

Buenos Aires has many interesting places to visit. Many of them are not so well-known, that's the case of the "Mitre Museum" where one the presidents of our country lived at the beginning of 20th century. It is placed downtown, and it's very nice. It counts with a library, and definitively, it should be a must-see spot. At this very moment it's a place where to hide when you need some time off when in the "jungle".