The Basilica of Saint Louis, King of France, formerly the Cathedral of Saint Louis, and colloquially the Old Cathedral, is a Catholic church in St. Louis, Missouri. It was the first cathedral west of the Mississippi River and until 1844 the only parish church in St. Louis. It is one of two Catholic basilicas in St. Louis and both are named for King Louis IX of France.
Location: 209 Walnut Street, St. Louis, Missouri, United States