The main chapel of the Couvent des Soeurs Grises (Convent of the Gray
Nuns), now owned by a university.  The gray nuns name doesn't come from
the color gray; rather, the founder's husband was a whiskey trader and
the purpose of the convent is to help the down-and-out, who happen to
frequently be drunk.  Thus, the nuns acquired the name "soeurs grises"
-- slang for drunk sisters.