One of the few places in the world where you can gaze, for free, at sunspots and solar flares through high-powered solar telescopes; and at planets, comets and stars through night refractor telescopes.
It is also a great place to take in sweeping views of the City of Angels below.
Tue-Sun, noon-10pm, generally
Metro Rail / Bus: Vermont / Sunset station (red), then take the DASH shuttle ($1 roundtrip) to the Observatory
Parking $4 an hour