Places and Spaces: Mapping Science is a great site for a wide variety of interesting maps. Some highlights are:
Carte du Tendre (Map of Affection or Tenderness). I can only imagine what lurks in La Mer Dangereuse.
Ph.D. Thesis Map by Dr. Keith V. Nesbitt. I’m still trying to figure out which step on the path towards a Ph.D. corresponds to Picadilly Circus.