St. Paul Cathedral is very popular. It not only has a large group of parishioners, but it's also an attraction and visited by thousands and thousands of people each year. It was first opened in 1915. That was when they held their first mass. It was not actually completed until about 20 years after that, but at almost 100 years old, it's just a magnificent building. It's the fourth largest Catholic Cathedral in the country. From what I understand, it's free to get married there, but you probably need to be a Catholic and be a member of the congregation. Their website is www.cathedralsp.org. There are free narrated tours. During the holidays they have public concerts and that kind of thing.