Vou can show up and buy tickets but if maximum head count is already inside may have to wait til someone leaves or the next time slot is open.
Buying the ticket online is much faster. This also allows you to select a particular timeslot you can enter the exhibit.
Ticket
You can do either we just showed up and had to wait about 40 minutes to enter because tickets have time slots.
You have to buy tickets online is faster
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