I agree that graveyards are meant to be visited. I've been to a few while researching genealogy and to one so far for this hobby. Some of the larger ones even have regularly guided scheduled tours and handouts with directions to graves of famous people or the most artistic sites. I've also seen cemetery websites which list the types of birds in the area for birdwatchers. I wouldn't think you'd want to place a cache right on someone's gravesite or in the flower pots unless it was okay with the family. Besides, don't the flowers and things get cleaned out every once in awhile? The cache would get thrown away.
