original name. Sky Trek Tower was built as and still remains, the tallest freestanding structure in Lake County, Illinois. Also added was Southern Cross, a third gondola sky car ride which offered a round trip and a much higher view than the other two, whose station replaced the removed Gulf Coaster. A few new spinning rides were added, such as Big Top, Davy Jones' Dinghies and Hay Baler. The park's first children's section, dubbed Fort Fun, opened in the section designated the Yukon Territory in 1978, which caused the Saskatchewan Scrambler to be relocated to Hometown Square and renamed Hometown Fun Machine. Additionally, Great America's fourth roller coaster, Tidal Wave, was a Schwarzkopf Shuttle Loop that opened in 1978 in Yankee Harbor. The Pictorium, an IMAX theatre, opened in 1979 and claimed to have the world's largest screen, at 64.5 by 88.25 feet (19.6 × 26.9 meters). The Turn of the Century roller coaster closed and took on a new look in 1980. Two vertical loops were added, along with two tunnels and the "new" ride was re-themed and renamed Demon. The ride featured an original theme song and new hellish theme elements, some of which were removed following a backlash from those who thought that the ride's theming was too "demonic". The American Eagle, a racing wooden roller coaster, opened in 1981. The tracks share a drop of and they reach speeds of . The bottom of the first drop is built below ground level. When the American Eagle first opened, it had the longest drop and fastest speeds of any wooden roller coaster in the world. It remains the tallest, fastest and longest twin racing wooden coaster. The Picnic Grove was added in 1982, allowing for more company outings and corporate events to take place at the growing theme park. No new rides were added that year, and several small rides were removed in the last years of Marriott ownership. Southern Cross was removed in 1983. That same year, The Edge, an Intamin first-generation freefall ride, was added to much fanfare. Bottoms Up, a Chance Trabant ride and Traffique Jam were removed at the end of the 1983 season. The last ride Marriott added to the park was White Water Rampage in 1983, an Intamin-built rapids ride that was later renamed Roaring Rapids and remains the park's most popular water ride. The ride was added to Orleans Place,