I was so honored to meet with David Rumsey in San Francisco a few years ago. He had such a nice selection of maps, mostly very old maps. The most interesting one were two maps that look like a lamp, they were dated 100 years back. I was so amazed of how people could use their hands to draw such detailed map, also what knowlege they have to produce it. I remember when I was a teenager, I draw a Map of China and used a month to finish, then I hang it on the wall to look at it and show it to other people for a very long time.