The Norton Simon Museum is known around the world as one of the most remarkable private art collections ever assembled. http://www.nortonsimon.org/
"Mid-sized, easily navigable museum with exquisite art collection spanning early Renaissance through the 20th-century and centuries of South and Southeast Asian art. Highlights include works by Raphael, Rembrandt, Degas, Manet, Van Gogh and Picasso. Lovely sculpture garden with cafe operated by the Patina Restaurant Group, and Museum Store full of books, art supplies, stationery and games. Exciting events and educational programs held year-round. Free parking and easily accessible by public transportation."