Historic Griffith Observatory is an icon of Los Angeles. It’s a “national leader in public astronomy, a beloved civic gathering place, and one of southern California's most popular attractions”, according to their website. Located above the Los Feliz neighborhood, “it is 1,134 feet above sea level and is visible from many parts of the Los Angeles basin.”
This is a great place to come visit, especially for families with kids. Even if you’re not that interested in astronomy, it is still a very educational site and the view of Los Angeles is as good as it gets. The ongoing exhibition has some cool information and the pendulum in the center of the building is a complex and fascinating explanation of the rotation of the planet. All in all, an interesting and well presented astronomical exhibition. They also feature shows, exhibitions and tutorials for the public, free of charge; plus, there are some shows at the Samuel Oschin Planetarium for which you will need a ticket (last week it was $7).
Free of general admission fees, the Observatory opens Tuesday-Friday from noon to 10:00 p.m. and weekends from 10:00 a.m.-10:00 p.m. It is closed on Mondays.
The address is: 2800 East Observatory Road, Los Angeles, CA 90027. Parking is available free; however, the lot is small, but you may also park on the street.