Mentioned by Busy Tourist
70 Best & Fun Things To Do New Orleans (Louisiana)
"The St. Louis Cathedral isn’t one of New Orleans’ most-flocked-to points of interest for nothing. It has a special place in history as America’s longest-running, an active church of the Roman Catholic faith. The cathedral’s history stretches back to 1789, which is when it was dedicated to France’s Louis IX, but as far back as 1718, there was already a church on the grounds."