On the grounds of the College of Saint Benedict in St. Joseph, Minnesota is Sacred Heart Chapel. Built in 1914, the unassuming entrance leads to a much larger and grander building. Although I didn't have enough time to get out and explore more (maybe on another trip), you can see additional photos including interior shots here.
Also on the college grounds I spotted this other tower.
Linking up to InSPIREd Sunday - a weekly meme of religious architecture.