Stone Mountain the second Ku Klux Klan in 1915. It was purchased by the State of Georgia in 1958 "as a memorial to the Confederacy." Stone Mountain Park officially opened on April 14, 1965 – 100 years to the day after Lincoln's assassination. It is the most visited destination in the state of Georgia. Stone Mountain is more than in circumference at its base. The summit of the mountain can be reached by a walk-up trail on the west side of the mountain or by the Skyride aerial tram. Stone Mountain is a pluton, a type of igneous intrusion. Primarily composed of
Standing Stone State Park of hiking trails are maintained in the park and forest. The most popular trail is the Lake Trail, which descends from the visitor center to Standing Stone Dam and parallels most of the north shore of the lake before reascending to the cabin area. The most substantial trail is the Cooper Mountain Loop Trail, which circles through several miles of the state forest on the slopes of Cooper Mountain before reentering the state park near Overton Lodge. The National Rolley Hole Marbles Championship is held every September at Standing Stone State Park. Rolley hole is a type of marbles game