Converted from a 13th-century convent of Dominican nuns , the Mus ? ? e d 'Unterlinden provides a perfect setting in which to view one of the world 's undisputed masterpieces of religious art , Matthias Gr ? ? newald 's awe-inspiring Isenheim altarpiece .
The Musee d 'Unterlinden was once a convent in which more than a hundred nuns resided .