Caledon State Park is a 2,579-acre state park located in King George, Virginia. As of 2010, the yearly visitation was 49,328. The property was initially owned by the Alexander brothers, founders of the city of Alexandria, and was established in 1659 as Caledon Plantation. Ownership passed, in 1974, to the Commonwealth of Virginia. A 302-acre portion of the park known as the Caledon Natural Area was designated a National Natural Landmark in 1974 for its old-growth oak-tulip poplar forest.