St. Paul’s Cathedral, the cathedral of the Roman Catholic Diocese of Pittsburgh, in the Fifth Avenue monumental district. (The Oakland neighborhood has at least three cathedrals—Roman Catholic, Greek Orthodox, and Antiochian Orthodox—or four if you count the Cathedral of Learning.) A cathedral is the architectural equivalent of a coral reef; over the centuries, it accumulates a diverse ecosystem of art and history. St. Paul’s is only a little over a century old, but it’s beginning to show signs of the rich diversity that only time can bring.
