The civic museum of Riva del Garda is housed in the old fort. The fort was built following a treaty in the 12th Century between Altemanno and the townspeople of Riva. It underwent several transformations and enlarged by the Della Scala family, the Venetians, and the Bishop Princes of Trent and in 1852, the Austrians renovated it further. The Civic Museum has archaeological, geological and mineralogical exhibits, as well as an art gallery, and collections of weapons, prints and rare books.