Moscow is the political and economic center of Russia, housing many of the country's government institutions and over half of its commercial banks. It has over 5,500 restaurants, 600 museums and art galleries, 350 sports arenas, and 100 parks. One third of Russia's academic workers and over one million undergraduate students are concentrated in Moscow. The city attracts over 4 million tourists annually, mostly from Germany, the US, China, UK, France, Italy, Israel, Japan, and Spain. Moscow has a robust transportation infrastructure including airports and the metro system.