National Museum of the Viceroyalty (Museo Nacional del Virreinato) is adjacent to the Church of San Francisco Xavier, within the restored monastery. It houses 3 centuries' worth of colonial and religious art. Highlights include rare 16th-century vestments and altar hangings, gold and repoussé silver monstrances from the 17th century and a painting of the Virgin attributed to 17th-century Spanish artist Bartolomé Esteban Murillo.
In addition to the priceless artworks there are many other colonial-era treasures, including weapons, armor, porcelain and ceramic figures, furniture, glassware, musical instruments and sculptures created from sugar cane paste.
Pastorelas, traditional re-enactments of Christ's birth, are performed during the Christmas season. Travel agencies in Mexico City can arrange for reservations, which should be booked well in advance.