taking shelter

I have not been able to learn the history of this sign.  The word "abri" means "shelter" and the images would suggest it's a bomb shelter.  The sign points in the direction of the caves that were created long ago when stone was removed to build local châteaux and other important structures.  Thus deep underground caves would make for ideal shelters from any bombardments.  Amboise was in the occupied zone (by the Germans) throughout World War II, so depending on how events unfolded, I suppose it's possible bombing could have come by either side.  In any case, bombing fortunately didn't happen and Amboise was spared.  But back to the sign.  Since it has the dates on it, I must assume this was put up after the fact to note the history of the place, but I still find it a bit intriguing.  Nowadays, the caves are mostly used as family dwellings.  And very well insulated ones at that.