Its donation based
The $25 you pay is worth every penny. The extras that they offer are also worth the money. If you are going to do multiple things while you are there though I would recommend the City Pass which is a great deal and offers multiple options for site seeing such as this museum, The Met, 9/11 Memorial, Empire State Building, Ellis Island and Statue of Liberty and more.
Pay what you wish. Suggested adult admission is around $23
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