Mount Wilson. Just drive north on the Angeles Crest Highway (the 2) to Mount Wilson Road and turn right at the Haramokngna American Indian Cultural Center outpost.
This quiet spot is a small museum of artifacts of the Native Americans who lived in this area before the Spanish came. They were the Tongva, the Chumash and the people they traded with. They're not exactly gone, either. Their descendants still live in the LA basin today.
There's going to be a public Basketweavers Day this Saturday, August 6th, featuring a basketry exhibit in the Toypurina Gallery and workshops by Southern California weavers. It's a good day to stop in at Haramokngna, which means "Place where people gather."