Doug McCune, who descibes himself as a "data visualization engineer", created 3D crime maps for San Francisco. They look like topographical elevation maps because raised portions represent reported criminal incidents. Pictured above is a display of prostitution in the city.
Link via
io9
The big peak is the "South of Mission" district and the next larger is near the Nob and Russian hill districts. Guess it fits that nearly the largest peak is where the bankers, railroad tycoons, etc., used to have their mansions.