Roman Pool

This used to be the end of the tour. You were warned not to jump in the pool, under threat of arrest. Now you catch the return shuttle just outside.
Hearst Castle is kind of away from any metropolitan area. San Luis Obispo is the closest airport and that's at least 45 minutes in the car. Still, I think this is important for Americans to see and if you are ever touring on the Central Coast, you need to come here.