Historic maps and cityscapes. I run across these as I do my research sometimes, and I always end up making copies of my favorite maps for myself, or making prints of scans from libraries and such to hang on my own wall. Generally these come from scans of public-domain resources from collections like the Library of Congress. These reproductions do show the flaws from the original images (creases, tears, darkenings or stains, overlaps between scan areas, other marks of age). However they are beautiful images and they give excellent, detailed prints.