Fortifications of Paris in the 19th and 20th centuries

Columns: Dir | Name | Emplacement
15 | S/W | Fort de Châtillon | Châtillon-sous-Bagneux Fontenay-aux-Roses | 16 | S/W | Fort de Villeras | Saclay | 17 | S/W | Batterie de Bouviers | Guyancourt | 18 | S/W | Batterie du Ravin de Bouviers | Versailles | 19 | S/W | Fort du Haut-Buc | Buc ( Yvelines ) | 20 | S/W | Fort de Saint-Cyr | Montigny-le-Bretonneux

Example questions:
What new French town is the fort now used as a film depository in ? | When was the fort built in the French commune located 9.5 from the centre of Paris completed ? | What institution used the French fort in the Seine-et-Marne département as a research centre ? | What French town is the commune where a fort covering 30 acres was built twinned with ?

Answers:
Saint-Quentin-en-Yvelines | 1879 | Commissariat à l'énergie atomique | Shepshed