The MappingDC group sponsored a mapping party today at Manassas Battlefield Park west of Washington,DC. We'll be uploading our traces and editing these over the next few days. In addition to mapping trails, we collected waypoints for many historical/cultural landmarks such as cannon batteries, monuments, and ruins. This is one area where the OSM tag set needs to be extended to accommodate these kinds of features.

http://mappingDC.org/