Set in a partially restored convent dating back to the 16th-17th centuries, this museum houses a large and diverse collection of masks drawn from several regions of Mexico and from other cultures around the world. Masks from different regions and eras are grouped together by themes and uses, including masks used in Carnival and in religious pageants, such as those commemorating the Reconquista. Particularly interesting is the alternate incorporation and subversion of pre-Hispanic symbols. The Diablo room is not to be missed. Portions of the convent grounds that could not be restored have been converted into a garden, with crumbling walls, standing arches and greenery.