Marilyn Monroe pretended to marry Joe DiMaggio at Sts. Peter and Paul, in 1954 and took wedding pictures on the steps.
Their actual marriage took place at the City Hall, as the first Mrs. DiMaggio was alive at the time and the Catholic Church is strict about these things. In fact, the first Mrs. DiMaggio did get married to Joe here, which must have stung.
Do what Marilyn could not - go inside. It's beautiful.