Bloc Session Marne-la-Vallée on Clmb House. Venue in 70 Rue Jacquard, 77400 Lagny-sur-Marne, France, France. Bloc Session Marne-la-Vallée in Lagny-sur-Marne is a bouldering gym in the Bloc Session network, open 7 days a week, for beginners to experts from age 4, wit...