There are two branches of the National Library, with the main branch in Yerevan comprising 6.2 million volumes as of 2002. The main library of the Armenian Academy of Sciences in Yerevan has 4.4 million volumes. The Armenian Academy of Sciences and the universities each have research libraries. Yerevan's museums include the National Gallery of Arts; the Yerevan Children's Picture Gallery, a unique collection of children's art from Armenia and around the world; the Museum of Modern Art; the House Museum of Ovanes Tumanjan, Armenia's most renowned poet; and the Museum of Ancient Manuscripts. There are also museums devoted to the composer Aram Khachaturian (including his piano) and the filmmaker Sergei Paradjanov, Armenia's most famous sons.