Martinsville Speedway is an International Speedway Corporation-owned NASCAR stock car racing track located in Henry County, in Ridgeway, Virginia, just to the south of Martinsville. At 0.526 miles (0.847 km) in length, it is the shortest track in the NASCAR Sprint Cup Series. The track was also one of the first paved oval tracks in NASCAR, being built in 1947 by H. Clay Earles. It is also the only race track that has been on the NASCAR circuit from its beginning in 1948. Along with this, Martinsville is the only NASCAR oval track on the entire NASCAR track circuit to have asphalt surfaces on the straightaways, then concrete to cover the turns.