Moscow is the capital and the largest city of Russia. It is also the largest city in Europe, with Moscow metropolitan area ranking among the largest urban areas in the world. Moscow is the country's political, economic, religious, financial, educational and transportation centre. It is located on the Moskva River in the Central Federal District, in the European part of Russia. Historically, it was the capital of the former Soviet Union and the Grand Duchy of Moscow and Tsardom of Russia, the pre-Imperial Russian states. It is the site of the Moscow Kremlin, which serves as the ceremonial residence of the President of Russia. Moscow is a major economic centre and is home to the largest number of billio...

  ... naires in the world; in 2007 Moscow was named the world's most expensive city for foreign employees for the second year in a row. It is home to many scientific and educational institutions, as well as numerous sport facilities. It possesses a complex transport system, that includes one of the world’s busiest metro systems which is famous for its architecture and artwork