Twisted Colossus is a steel roller coaster under renovation at Six Flags Magic Mountain in Valencia, California. Originally designed and built by International Amusement Devices, the roller coaster opened as Colossus on June 29, 1978. It was the tallest and fastest wooden roller coaster in the world and the first with two drops greater than 100 feet (30 m). Colossus became well known after appearances in film and television, including the box-office hit National Lampoon's Vacation.