For much of the last half-century, the few North Americans interested in the extraordinary ecclesiastical architecture erected during the 1500s south of the U.S. border had to depend on just two monumental tomes in English: George Kubler’s Mexican Architecture of the Sixteenth Century (New Haven: Yale University Press, 1948) and John McAndrew’s The Open-Air Churches of Sixteenth-Century Mexico (Cambridge, Mass: Harvard University Press, 1965). Perhaps because the scholarship of these works was so weighty, gringo...