Maybe because it's free and the staff are volunteers? You could always come back the next day with the same ticket to see the things you missed the day before!
Agree with Mr Quinn
So people don't sleep in it
Not sure this is a great question. Just the parks hours?
Yeah I'm not sure either, it may be because it is a public institution and it closes like other things do such as museums and Shedd Aquarium. But I don't know.
Not sure how to answer this? It just does the management made it that way
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