At the beginning of the 20th century, the dilapidated city wall tower, also called the Feldhüterturm, was replaced with a neoclassical water tower The 100 m³ water tank has since then towered over the whole of Rain. The nearby Lourdes Grotto dates back to the vow of a master mason in the early 20th century, who built this grotto for his recovery. Stalactites come from the Swabian Alb in Blaubeuren.
visiting hours: approx. 30 mins