Chained around the city as both commemorations and visual reminder of cyclist's rights, ghost bikes, the ubiquitous white frames set up at the site of a cyclist's death, have become a part of the urban landscape. In an effort to chronicle this unique type of street art, Chicago Tribune reporter Charles J. Johnson built a map showcasing the location of these symbolic bicycles. While not comprehensive—especially since the bikes can sometimes be taken down by property owners—Johnson's map also includes a call to send in additional locations and missing memorials. A full map and photos is over at the Trib.
Cool Map Thing Archives [Chicago Curbed]