The well-restored 18th-century baroque Cathedral, on the plaza's west side, is more magnificent inside than out. Over the altar at the east end of the south aisle is a painting of the Virgin of Guadalupe by Miguel Cabrera. There are more works by Cabrera, colonial Mexico's finest artist, in the cathedral's pinacoteca (picture gallery). It's open at Easter only (although if you are lucky, ask a priest and he might let you in).