OK...scary, weird, uncanny moment here!! I was just on that site YESTERDAY looking at these exact same pics and almost posted a link to it here in the forum. Now I'm glad I didn't, because I hadn't realized that Peter already had. Awesome!
These pics are amazing, and I'm with Mac. I could spend all day looking at them. I was also looking at Lawrence, KS; San Francisco, CA; and Chicago, IL. Very cool pics. There was another link I found that showed NYC in roughly 10-year intervals during the 1800's. Again, very cool. Here you go...http://sunnycv.com/steve/maps/list-birdseye.html