You could go to the walk-up window at 1 p.m. each day and get them.
If you go on a weekday your don't need a ticket. It's weekends taht you do because the volume traffic is so high
And it's currently off season so no reservation necessary. You can and should go earlier than 1 pm because there's a lot to see. Do the lower 3 levels(C1-C3) first.
it's best to go when they first open
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