Try maybe asking one of these….. http://www.geocachingonline.com/directory/Associations_and_Clubs/North_America/United_States/Virginia/

We didn’t get a chance to visit Williamsburg, but we did visit the Yorktown battlefield not too far away. The virtuals there are worth the visit, as is the rest of the area. Some of the Revolutionary cannonballs are still lodged in the buildings, and some of the Civil War era earthworks from the Peninsula campaign are also in place.