Exhibitions and lifelike dioramas containing more than 150 vehicles sprawl across Petersen Automotive Museum's 300,000-square-foot confines, illustrating the impact of the automobile on American culture. On the first floor, permanent collections elucidate with detailed displays covering the role of the car in Los Angeles and motion picture, the history of alternative power, and the favorite engine sounds of each president. The Hot Wheels Hall of Fame parades more than 1,000 Hot Wheels vehicles, original models, and design sketches. Five galleries on the second floor shelter rotating exhibits, and the third floor's May Family Discovery Center introduces tykes to the fundamental functions of cars with interactive driving stations. Patrons wander among the extensive displays individually or join tours for groups, schools, car clubs, or families of parking cones.