Abbey Jumièges is an incredible site, both because no roof ruin is present, but with important elements intact towers, facades and walls, it offers an incredible look. A majestic site.
Royaumont Abbey is located in the Val d'Oise, it is one of the largest abbey in the Paris region. A haven to visit.
The abbey of Vaux-de-Cernay is a former Cistercian monastery, both in ruins and preserved, it is located in Chevreuse Valley in a beautiful park.