The oldest roller coaster currently operating at Six Flags Great America in Gurnee, Illinois, is Whizzer, which opened with the park on June 14, 1976. Originally named "Willard’s Whizzer" after Marriott’s then-CEO, it is one of the few remaining "Speedracers" designed by Anton Schwarzkopf. Unlike modern thrill coasters, Whizzer uses a spiral lift hill and features low-to-the-ground, high-speed banked turns through a wooded area, providing a unique "bob-sled" sensation. While the park has considered removing it in the past (notably in 2002), a massive outcry from fans saved the ride, leading to its designation as an American Coaster Enthusiasts (ACE) Landmark. It remains a beloved family favorite for its smooth ride and historical significance, standing as a living piece of the park's original 1970s identity alongside newer giants like Maxx Force and Goliath.