En : Notre-Dame de Longpont abbey of Gothic architecture is a former Cistercian fortified abbey, its ruins are located in Longpont in the department of Aisne in Picardie (Hauts-de-France). Beginning of construction in 1131 and end of construction in 1227. Very interesting place to visit about 85 km north-east of Paris, near Soissons and Pierrefonds and Compiegne.