Growing up in LA, we had a few of these around. The most famous of course was Universal Studios, where you could pay for a tour. But my favorite was Paramount Ranch. A bunch of stuff was filmed there in the 50s-70s, and it was open the public. I actually used it to make a movie with my friends in high school. It was pretty cool to have a prebuilt town around that was basically empty.
It's all charcoal now though