Locals tend to divide the Black Hills into two areas: "The Southern Hills" and "The Northern Hills". The Southern Hills is home to Mount Rushmore National Memorial, Wind Cave National Park, Jewel Cave National Monument, Harney Peak (the highest point in the United States east of the Rockies), Custer State Park (the largest state park in South Dakota, and one of the largest in the US), the Crazy Horse Memorial (the largest sculpture in the world), and the Mammoth Site in Hot Springs, the world’s largest mammoth research facility. Attractions in the Northern Hills include Spearfish Canyon, historic Deadwood, and the Sturgis Motorcycle Rally, held each August. The first Rally was held on August 14, 1938 and the 65th Rally in 2005 saw more than 550,000 bikers visit the Black Hills. It is a key part of the regional economy. Devils Tower National Monument, located in the Wyoming Black Hills, is an important nearby attraction and was the United States's first national monument.