HistoryBox.com?
Check it out — there be good stuff.
For example, abundant sources of information and especially images on the history of New York City can be found here. It’s in directory form, so you may need to click once more to get what you need — but so far, everything I’ve clicked works, and it always seems to go to a good site.
New York state resources, here.
The U.S. history portion is not working yet.