Six Flags America 13710 Central Avenue
Upper Marlboro, Maryland 20775
History: Operating since 1982. AKA Adventure World (1990 to 1998)
Wild World (1982 to 1989). The Adventure World name change also changed the park's focus away from water rides to a more traditional amusement park. With the Six Flags changeover came more amusement rides and the Six Flags characters, turning the park into a modern theme park.