TheBeanTeam:Good idea.
The general places like Rome need to have a central location identified as the spot to waymark it.
City hall or it's equivalent. Visits to these could be anywhere in the city as long as they add coordinates and encourage a photo for the visit log.
As far as I can tell, most of the indexed sites feature photos or mention specific landmarks/must sees. Submissions would be required to be "localized" to a central or recognizable set of coords.