The Harley-Davidson Museum near downtown Milwaukee contains more than 450 Harley-Davidson motorcycles and many artifacts from the manufacturer's 110-year history. The museum attracts an estimated 300,000 visitors annually. Permanent exhibitions are spread throughout two floors, in addition to temporary exhibits and the motor company’s archives. The complex also includes a restaurant, café, retail shop, and special event spaces. The Harley-Davidson Journey galleries relate the company's history from its origins in a 10x15-foot wooden shack to its current status as the top U.S. motorcycle manufacturer. The Engine Room exhibit displays a Knucklehead engine disassembled into several pieces. The Engine Room also features several interactive touch screen elements that show how Harley motors, including Panhead and Shovelhead motors work.