mill wheels in the rock at the regensteinmühle in blankenburg in the sandstone rock landscape. harz national park. saxony-anhalt

ancient anhalt architecture attraction bastion blankenburg castle climb destination europe excursion forest fort fortifications fortress germany harz heritage hike hiking hill historical history industrial landmark landscape medieval mill mountain national natural nature old outdoor park rainstone regenstein regensteinmühle rock ruin ruined sandstone saxony saxonyanhalt scenery sight stone tourism travel trekking wheel wheels wood