Ostankino Tower is a television and radio tower in Moscow, Russia. Standing 540.1 metres (1,772 ft) tall, Ostankino was designed by Nikolai Nikitin. It is currently the tallest freestanding structure in Europe and sixth tallest in the world. The tower was the first free-standing structure to exceed 500 m (1,600 ft) in height. Ostankino was built to mark the 50th anniversary of the October Revolution. It is named after the Ostankino district of Moscow in which it is located.