St Maria zur Höhe is a squat and architecturally less refined 13th-century hall church. Its sombreness is brightened by beautiful ceiling frescoes, an altar ascribed to the Westphalian painter known as the Master of Liesborn, and the Scheibenkreuz, a huge wooden cross on a circular board more typically found in Scandinavian churches; in fact, it’s the only such cross in Germany. Look for the light switch on your left as you enter to shed some light on the matter.