This site has a nice photographic representation of The Parete Gaudenziana. So nice, to properly represent it, they decided to go with a 8.6 Gigapixel image! Of course, the Gigapixel Project has been documenting large photos for awhile, but I believe most of their work is in the single gigapixel range. This sucker is over 8 times as large! You can zoom in and around the image to see how fine they captured the information.