Yes its absolutely free.
Excuse me, I hadn't checked your answers and I'll tell you, I left and since I thought it was free for just one person and nobody said anything to me, they stopped me and I saw a row and I said they'll be buying shirts, then the next time I went there was already a sign outside that you pay to see the exhibition at the end and been like 6 times in three years
No
Admission price adult 650 senior citizen 450 children 450 children under free
There is a minimal charge to go inside to see the exhibits. About $7 for adults and $5 for children (4-17).
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