Excellent idea this, ..... But with regards to French sites listed on the Megalithic Portal, "Google Earth" doesn't provide any satellite photos with enough detail ...... With google one gets a very distant blurred patchwork of fields when viewing French sites.... Using "Geoportail" (IGN site) photo of the 'Menhir du Ger', I can zoom in close enough to see the stone itself...
http://www.geoportail.fr/
Something is not right. This message is just to keep things from messing up down the road