The Donjon de Maurepas is a ruined medieval castle in the town of Maurepas, in the French département of Yvelines.
Wikipedia https://en.wikipedia.org/wiki/Donjon_de_Maurepas
Address 2 Rue de l'Église, Maurepas 78310, France
Coordinates 48°46'21.039" N 1°55'14.356" E