regenstein mill in blankenburg in the sandstone rock landscape. harz mountains national park. saxony-anhalt, germany

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 military mill mountain mountains national natural nature old outdoor park rainstone regenstein rock ruin ruined sandstone saxony saxonyanhalt scenery sight stone tourism travel trekking wheel wood