Depends on your age and discounts. I recommend checking the website. Tour groups also offer combination packages to both the museum and the tower
https://www.911memorial.org/visit-museum-1
When I went, admission without the guide was 26$. I believe the prices may change depending on anticipated attendance, but the chart here is accurate. I do recommend trying to get your tickets online, as you can bypass the purchasing line and move through security that much faster. https://www.911memorial.org/visit-museum-1
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