Six Flags Magic Mountain, originally Magic Mountain, is a theme park located in the Valencia neighborhood of Santa Clarita, California, northwest of downtown Los Angeles. It opened on May 29, 1971, as a development of the Newhall Land and Farming Company and Sea World Inc . In 1979, Six Flags purchased the park and added the name "Six Flags" to the park's name. With 19 roller coasters, Six Flags Magic Mountain holds the world record for most roller coasters in an amusement park. In 2017, the park had an estimated 3.3 million visitors, ranking it sixteenth in attendance in North America.