Communion of the Saints

Church architecture and decoration can certainly signal denomination affiliations and theological leanings (the Roman Catholic Church's high view of papal authority corresponds to their high pillars and steeples, while anti-hierarchical Protestant churches tend towards lower roofs and buildings). And looking at the content of a church's decorations/iconographic pictures can tell you of the larger social & geographic locations of the church. For example, Our Lady of the Angels in Los Angeles features a large tapestry of John Nava's "Communion of the Saints," part of which is pictured below:

This is a theologically profound tapestry to be featured in a Roman Catholic church, for it is complete with both venerated saints of the church, and those who are not Saints or "unnamed" people. One would not be surprised at the diversity found in this tapestry if one were looking at the art of a progressive denomination (The Episcopal St. Gregory's in San Fransisco famously features art of Harvey Milk and Malcolm X as Saints of God) - but the fact that this is a tapestry in a very large Roman Catholic church lends to the idea that if this church is in the United States it could only be located in a liberal, large city. Examining the art and architecture of a church building can teach you a significant amount of information about the location it is in.