Hello Hans i visited your album , you are realy a specialist about stoppings citadels bunkers..foundation rafts... very interesant !
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for your information, do you know, this year is the Vauban year it marks the tercentenary of Vauban's death.
With this occasion France deposited a candidates file for inscription of 14 sites strengthened by him on the list of world inheritance of humanity of UNESCO
He also was in his time ( 1680 )a promoter in France of defensive flood.....
thanks for your comments PaP ... and interresting information ..i will google on Vauban one of these days for sure !
where do you live in France ?? ...we are gooing to the Morvan in august !!