Back in the Day
One more map related link and then we'll move on to other amazing things.
The thumbnail picture above (taken from a much larger image) is my best guess at where the Space Needle is in Seattle, except that it's not there yet, seein' as the picture is from 1884. (Someone from Seattle can set me straight on the location.) So the amazing part is that this Library of Congress site has high resolution scans of old maps and drawings from all over. Search for your favorite city today.