The city has a large number of buildings remaining from the 17th and 18th centuries; however, many parts of the town are dominated by Soviet era apartment blocks, dating mainly from the 1960s, similar to other provincial towns which expanded rapidly due to fast industrialization. These buildings are nearing the end of their service life and are in need of serious repair and, in many cases, replacement. Industrial enterprises are mainly located to the north of the town center. The eastern part of Saransk, located east of the Insar River, is Posop. An interesting detail is the Soviet era military base, belonging to the Russian Ministry of Internal Affairs, which is located along the railway lines and serves of a time when Saransk was, effectively, a closed city. Another city landmark is the Saransk TV Tower – a 180-meter-tall guyed tubular steel mast built in 1961.