Loved our tour here. Nice, in August, when the crowds aren't around... able to stroll around at our leisure. They offer free guided tours, we went at 11am. This place was almost not saved, that would have been a travesty. Definitely worth a couple of hours to check this amazing place out... and highly recommend doing the tour. They also have a self-guided tour but the guide adds more info and you can ask questions too!
Don't miss the train car off to the side. Go on a nice day and dream!