The Moscow Metro is a rapid-transit system serving Moscow, the capital of Russia, and the neighbouring cities of Krasnogorsk, Reutov, Lyubertsy and Kotelniki in Moscow Oblast. Opened in 1935, it was the first underground railway system in the Soviet Union. This photograph shows the central hall of Elektrozavodskaya, a station on the Arbatsko–Pokrovskaya line. The station was built as part of the third stage of the Moscow Metro and opened in 1944, and is known for its architectural decoration, including rows of inset electric lights on the ceiling and marble bas-reliefs on the walls.Photograph credit: Alexander Savin