The Château de Beaumont-sur-Oise is a ruined medieval castle in the commune of Beaumont-sur-Oise in the Val-d'Oise département of France.
Wikipedia https://en.wikipedia.org/wiki/Château_de_Beaumont-sur-Oise
Address 9 Rue Henri Sadier, Beaumont-sur-Oise 95260, France
Coordinates 49°8'37.995" N 2°17'10.589" E
