St. Peter's Cathedral stands near Muenster, east of Humboldt, and is the district's strongest architectural sight. The twin-towered church dates from 1910 and is tied to the German Catholic settlement of St. Peter's Colony.
Inside, the draw is the painting: Berthold von Imhoff's religious figures and scenes give the prairie church a richness you do not expect from the highway. Check access before making a special trip, since it remains an active religious site.