Yep, what they said.
Free entrance always, you do have to go on the website to get them. Try to get on early as possible in the morning.
Always free just need a ticket for admittance in the museum. You can only get tickets from their website.
The museum is always free, no paid admission. Timed entry passes are required. For the month of April the museum has a promo for walk up Wednesday's on a first come first served basis. Same day passes are available online beginning at 630am in the day of.
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