The Swiss city of Kreuzlingen and its German counterpart Constance hug the straits that lead from the Rhine River into Lake Constance.
When St. Peter's Cathedral was completed in 1260, its interior bore black, ochre and white paint. In the 1400s the congregation added gold leaf and all the colors of the rainbow. But visitors today will be struck with St. Peter's austerity, evidence of the 16th-century Reformers' desire to focus worshipers' attentions on God alone.
The exterior of the stone church at Romainmôtier looks as it did in the 11th century, when its existing walls were erected; its interior, including remarkably colorful wall paintings, date from the 13th century. Older still is the church's pulpit, crafted from the lid of a 7th-century tomb.
The Museum of the Reformation is a must-see for religious visitors to Geneva. The location itself is historic: The building once served as an apartment complex for Huguenot refugees, which was in turn built on the ruins of St. Peter's cloister.