Is it has any cost or it is free??

Adult Museum Admission $14.00 Senior Museum Admission (Ages 62+) $11.00 Student Museum Admission (With School ID) $11.00 Youth Museum Admission (Ages 13-17) $11.00 Child Museum Admission (Ages 3-12) $6.00

While the Museum is free to L.A. residents 3-5pm daily, there is a charge for general admission as well as additional exhibits. Please visit nhm.org/visit for more information on ticket pricing, and save if you book online!

Butterfly pavillion 6$, 3D movie - 6$. There are combo tickets like admission + 3D + Antarctic jurrasic for 27$ etc