Land added to City of Rocks reserve BOISE, Idaho (AP) — The National Park Service has added some additional public land to a national reserve site in Idaho known for its rock climbing opportunities. The agency added 22 acres of public land to the City of Rocks National Reserve south of Burley, thanks to an acquisition of private land that was already included in the reserve. The tract of land, known as the Gibson property, features the Dungeon, Crystal Cow and Electric Avenue rock formations.