Yes you need tickets.
I got them the day that I went but if you want to see Revelations you must get them ahead of time as that is separate
You can usually get tickets on site the day of your visit, but it is recommended to get online ahead of time.
While the tickets are free, there is a suggested donation of $15 for adult, and $10 for children 12 and under.
Yes, they are FREE tickets, but you have to get them online ahead of time. It helps ensure the museum doesn't get overly crowded, but instead spreads the line out.
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