Benjamin Sack creates wonderfully complex large scale drawings of imaginary cities, often in detailed, map-like projections.
There is a fascinating video on YouTube that steps through his process in filling out the drawing shown above, top (with detail).
I particularly like his fun take on Van Gogh’s The Starry Night (above, bottom, with detail).
There are some photos on this post by Jason Kottke — which is where I learned of Sack’s work — that show the scale of one of Sack’s drawings. Kottke points out that Sack’s work shares come characteristics with the large and detailed cityscapes of Stephen Wiltshire.