Open House NY is a really amazing program that lets you see buildings and beautiful architecture that you normally don't get to see, and it is a great opportunity. One weekend a year, usually in the first 1/2 of October, is when it happens, and this year, it is this weekend. There are many things that need reservations, and they actually stopped taking reservations this morning at 9:30 am, but there is still tons to do without reservations! So much to see...
This is the website, and just click on weekend, then plan your weekend.
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Also check out the Unseen NYC Tours link...fall is a beautiful time to go on a walking tour!