I stumbled upon a new camera obscura location in the Orange County Great Park. It is in the Palm Court Arts Complex, and looks temped in, but it is fully functional.
My wife and I stood in the darkened view space for 5 minutes until our eyes adjusted enough to see the upside-down image. The affect is magical. If you are a photography buff like me, pack a picnic lunch and give it a go. The park is free. So are the exhibits.