In December 2002 Bulvar Dmitriya Donskogo became the first Moscow Metro station that opened beyond the limits of MKAD. The Third Ring Road, intermediate between the early 19th-century Garden Ring and the Soviet-era outer ring road, was completed in 2004. The greenbelt is becoming more and more fragmented, and satellite cities are appearing at the fringe. Summer dachas are being converted into year-round residences, and with the proliferation of automobiles there is heavy traffic congestion. Multiple old churches and other examples of architectural heritage that had been demolished during the Stalin era have been restored, such as the Cathedral of Christ the Saviour.