Janis Joplin's Porsche (a 1965 356 Cabriolet). She bought it in September 1968 at the height of the era of flower power, and had it hand painted by a friend. She still owned it at the time of her death in October 1970. This was part of the Psychedelic Exhibition in Tate Liverpool in 2005. As of May 2007 it is in the Whitney Museum in New York.
The Nethercutt Museum-(Not Just Cars) I have been here 3 times and it doesn't cost to get in, just need to call in advance to get a reservation. Located in Southern California -Sylmar