The Basilica of St. Louis King of France, the oldest Roman Catholic Cathedral still in use in the United States. A stunning three-spired brick and post building, a type of construction used in New Orleans until the mid-19th century, its bells can still be heard tolling the hour. The soaring center spire is flanked by two smaller spires on either side and a perfectly symmetrical façade opening up to a pedestrians-only plaza facing Jackson Square. The park, with a statue of Andrew Jackson in the foreground, is New Orleans architecture…