The hotspots map is a working model, with the map changing as we work. Here are some of the older versions of the hotspots.
Working version of March 2007.
Top 13 hotspots (updated June 8, 2007).
August 2006 version.
More maximal set (updated October 2006).
Map from National Geographic Magazine, Oct 2007
Contents of site are the result of research by Gregory Anderson and K. David Harrison. © 2007