By Monica Surfaro Spigelman. Surely it is the light that first attracts us to this great house of worship. Light paints a magical scene at Mission San Xavier del Bac, the queen of all the Pimería Alta churches and the finest example of Spanish Mission architecture in the United States. Tourists and Tucsonans alike are inspired by the iconic structure which endures as both a work of art and as a sacred space. Read the full article.