Optional
The museum is funded only by donations. They don't turn anyone away. But the suggested donation is $19.95 for adults and $9.95 for children. Worth every penny! Pr you can get family plans for the whole year. Check out their website for details.
No, free entry, but there are some specific exhibits that cost. You can spend 6+hours setting all the free stuff first. They do recommend a donation.
No, is free. But they ask for a "donation" of $15
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