The amazing Museo Rafael Coronel is not to be missed. Imaginatively housed in the ruins of the lovely 16th-century Ex-Convento de San Francisco, it houses Mexican folk art collected by the Zacatecan artist Rafael Coronel, brother of Pedro Coronel and son-in-law of Diego Rivera. The highlight is the astonishing, colorful display of over 3000 masks (another 7000 are in storage) used in traditional dances and rituals. Also on display are pottery, puppets, instruments, pre-Hispanic objects and sketches by Rivera. The grounds and garden are a wonderful place to come and relax.