Caspian Sea also passes through the city. The Volgograd Bridge, under construction since 1995, was inaugurated in October 2009. The city river terminal is the center for local passenger shipping along the Volga River. The Volgograd International Airport provides air links to major Russian cities as well as Antalya, Yerevan and Aktau. Volgograd's public transport system includes a light rail service known as the Volgograd Metrotram. Local public transport is provided by buses, trolleybuses and trams. The Volga River still is a very important communication channel. Population Ethnic composition At the time of the official 2010 Census, the ethnic makeup of the city's population whose ethnicity was known (999,785) was: Culture Mamayev Kurgan Memorial Complex A memorial complex commemorating the battle of Stalingrad, dominated by an immense allegorical sculpture The Motherland Calls, was erected on the Mamayev Kurgan (Russian: Мамаев Курган), the hill that saw some of the most intense fighting during the battle. This complex includes the Hall of Military Glory, a circular building housing an eternal flame and bearing plaques with the names of the fallen heroes of the Battle of Stalingrad. This memorial features an hourly changing of the guard that draws many tourists during the warmer months. Across from this Hall, there is a statue called Mother's Sorrow, which depicts a grieving woman holding a fallen soldier in her arms. During the summer months, this statue is surrounded by a small water feature, called the Lake of Tears. Further down the hill of this complex, there is a Plaza of Heroes (also known as Heroes' Square), featuring multiple allegorical sculptures of heroic deeds. This plaza is sometimes referred to by the title of the most famous of these sculptures, called "Having withstood, we conquered death". Panorama Museum The Panorama Museum of the Battle of Stalingrad is a large cultural complex that sits on the shore of the Volga river. It is located on the site of the "Penza Defense Junction", a group of buildings along Penzenskaya Street (now Sovetskaya Street), which was defended by the 13th Guards Rifle Division. The complex includes Gerhardt's Mill, which is preserved in its bombed out state. The museum on the complex grounds houses the largest painting in Russia, a panoramic painting of the battlefield as seen from Mamayev Kurgan, where "The Motherland Calls" statue now stands. This museum also features Soviet military equipment from the 1940s, numerous exhibits of weapons