Ok, now I know:
PID 48227 and 48228: in fact it is the Dolmen de Doux at Pussigny on this pictures. The site is also known as Pierre-Levée (as so many othersites in France)
PID 48225 and 48226: the really belong to the Pierre Levée at Yzeures.
PID 31350 (Old photo of ocdolmen) depicts Palets de Gargantua.
Something is not right. This message is just to keep things from messing up down the road