In World War II, the château was a headquarters for German Field Marshal Erwin Rommel (1891–1944). After D-Day, he defended Normandy against the Allies in World War II from a bunker located here. In 1962, the castle was used as a setting for the medieval segment of the Belgian comic on time travel: Le Piège Diabolique (The Time Trap) of the Blake and Mortimer series by Edgar Pierre Jacobs. After 1990, restorations and archaeological surveys undertaken by the Conservatoire régional des Monuments historiques revealed new additions to the documentary history of La Roche-Guyon, undertaken in the 19th century by Hippolyte Alexandre and Emile Rousse. In early 1960, French technocrats had the idea for a new administrative capital, to replace Paris as capital with a French "Brasilia" built near La Roche-Guyon and to transform the commune into a "Monaco on the Seine". In early 1960, there was an architectural design competition for the Project, in which the architects Albert Laprade and Jean Brasilier participated. The castle is now open to the public. Points of interest Arboretum de La Roche-Guyon See also Operation Gaff Communes of the Val-d'Oise department References External links Official website Château de la Roche-Guyon: Official website Association of Mayors of the Val d'Oise " La duchesse d'Enville à la Roche-Guyon" History of the castle of the Roche Guyon (French) Communes of Val-d'Oise Plus Beaux Villages de France