It really is to do, free, climb 1 staircase, description of the site and a guard is present.
Entrance is on Broadway. You can go into the ground floor atrium but not upstairs. It's still worth a visit. Not crowded unless you're there when a tour group happens to be there too.
Yes also it's important to know they do a lot of filming you might be asked to be a background
Just walk in and it's free.
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