Santa Susana Field Laboratory

The Santa Susana Field Laboratory (SSFL), formerly known as Rocketdyne, is a complex of former industrial research and development facilities located on a 2,668-acre (1,080 ha) portion of Southern California in an unincorporated area of Ventura County in the Simi Hills between Simi Valley and Los Angeles. The site is located approximately 18 miles (29 km) northwest of Hollywood and approximately 30 miles (48 km) northwest of Downtown Los Angeles.

Source: Wikipedia — Santa Susana Field Laboratory (CC BY-SA 4.0)