I have been working on a new project at work and came across a few great resources. Of course this is always FLICKR and now Pinterest but there are still a lot of great sites out there with the old and arcane.
Old Book Art is a great website to browse. It is filled with old engravings and illustrations as well as old maps--the reason I first visited. It's a great resource for illustrators looking for reference. I'm certain that I'll be back when I finally get started on the children's book that my wife has written. And speaking of maps, this one shouldn't be missed. While not all maps found on Map Collection--Collection of Interesting and Artistic Maps are free or in the public domain, it is a great reference site. Decline and Fall Resources, like the aforementioned, is also a great resource.
These are just a few based upon what I was looking for. You could get lost in these sites for a very long time!
