Located in the commune of minister of Louis XV.
Left unfinished, this classical style building was originally intended to be a vast U-shaped ensemble with perpendicular wings. But only the eastern wing was built, consisting of a raised ground floor and an attic floor. It is also possible to admire a chapel reminiscent of that of Penthemont Abbey in Paris, another work by Pierre Contant d'Ivry. Covered with a Saracen-vaulted dome in brick and plaster, it is the most remarkable element of the site.
Arnouville Castle also has an orangery with Doric decoration and Louis XV style fireplace, as well as a 19th century entrance gate which replaces the original one now installed at the abbey of Vaux-de-Cernay.