For those of you in CA, don't know if this web site has been posted before: http://www.calsign.com/mining/ -- it's a "Database for Mining, Prospecting, Metal Detecting and Treasure Hunting in CA". It includes ghost towns, town sites, cemeteries, camps, old names of towns that have been changed or absorbed into other towns. Historical names, airports plus many other categories. There are literally thousands of locations covering all the counties and the great thing for GPS users, it provides lat and lon for each location. Just load it into your GPS and go for it.