The Mill on Rain (Mühle am Rain) is a functioning farm mill with undershot 4.20 meter wheel and 32 wheel blades. This 200-year-old Black Forest mill is driven by the water of Acher which is passed through a mill canal to the mill. The water is brought by a so-called wheel collars on the waterwheel. The drive leads from the mill wheel in the lower part of the mill. This part from large rubble masonry contains the drive mechanism of the mill.