One of the advantages of the  Journées du patrimoine, the annual heritage weekend, is that doors normally closed are open to the public.  Most Parisian courtyards are hard to peek into nowadays unless you happen to be around when someone enters or exits. The magnetic key used is necessary to ensure security. On this special weekend you may find courtyards of other buildings accessible. The sapeurs pompiers (the fire brigade) for our area opens its doors every September. They are also known for their July 14 (Bastille Day) fireman’s ball. Since 1812, our caserne des pompiers, 7 & 9 rue de Sévigné, is housed in a former prince’s domaine. The…