Taking the subway is a great experience. I went with friends in 2008 to see the old stadium before they knocked it over, and Bob Ryan of the Boston Globe was on the same car and talked with us the whole way there.
It's not a common attraction, but I would 100% recommend the Ground Zero Museum Workshop in the meatpacking district.
https://groundzeromuseumworkshop.org/index.htmlit's run by the guy who was the official photographer of the 9/11 recovery project. His level of access was unparalleled and there are lots of artifacts in the museum that will impact you in ways you will not expect.
WARNING: I have a deep-seated desire for others to love the Star Wars franchise as much as I do, in exactly the way I do, and get snippy and sensitive and passive-aggressive when they don't.