Griffith Park is a large municipal park at the eastern end of the Santa Monica Mountains, in the Los Feliz neighborhood of Los Angeles, California. The park covers a lot of land, making it one of the largest urban parks in North America. It is the second-largest city park in California, after Mission Trails Preserve in San Diego, and the 11th largest municipally owned park in the United States. It has also been referred to as the Central Park of Los Angeles but is much larger, more untamed, and rugged than its New York City counterpart.
Check out this outside link for more about the observatory: http://www.griffithobservatory.org