In the course of its growth, Belgrade spread southward and southeastward over a hilly terrain. A new district called New Belgrade (Novi Beograd) has been built on the plain west of the old city, between the Sava and Danube rivers. The old fortress of Kalemegdan is now a historical monument; its former glacis has been rebuilt as a garden, from which is seen a famous view of the plain across the Sava and the Danube. Belgrade is the site of numerous government offices and is also home to various cultural and educational institutions, including the University of Belgrade, founded in 1863. There are many museums and galleries, of which the oldest, the National Museum (Narodni Muzej), was founded in 1844. Pop. (2011) 1,166,763; (2020 est.) 1,692,768.