We can visit there free or pay?

Here are our admission rates: Adults: $15.00 Non-Harvard students with I.D.: $10.00 Seniors (65+): $13.00 Children ages 3–18: $10.00 Children under 3: Free For information on free admission times check our website: https://hmnh.harvard.edu/plan-your-visit

Pay

You have to pay but its reduced if you are a student

Nope...25,00