Six Flags Magic Mountain is the biggest theme park in Valencia, California, United States. It opened on May 29, 1971. From 1971 to 1979, the theme park was named Magic Mountain. It has 19 roller coasters (the most in the world) and 60 other kinds of rides, giving a total of 79 rides in the park. There are 9 themed areas, including DC Universe and The Movie District. In 2017, the park had an estimated 3.3 million visitors ranking it sixteenth in attendance in North America.