Yeah it's a guided tour, it's a place of business where folks are actively working, so you won't be able to explore the grounds, only very near the sites they take you. In fact, our Page almost took us into the Theater before he saw a Closed sign, and thought out aloud that he could have been in big trouble for just taking us into the atrium. And no, they take you back out through the gift shop, and out the exit, so you can't go back to explore.
No you can not explore on your own. It is a guided tour.
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