Dubna is a small town located on the banks of the Volga River, about 120 km north-east of Moscow. It was founded in the early 18th century as a shipbuilding center and quickly grew into a large and prosperous town. After the Russian Revolution of 1917, Dubna became a center of Soviet science, and many of the world's most famous physicists, including Igor Tamm, Andrei Sakharov, and Lev Landau, worked here. The town is home to the Joint Institute for Nuclear Research, the world's largest nuclear research center, and the Dubna Atomic Clock, the most accurate atomic clock in the world.