Hardenburg castle and fortress ruins © GDKE, U. Pfeuffer

© GDKE, U. Pfeuffer

©

Hardenburg castle and fortress ruins © GDKE, U. Pfeuffer

© GDKE, U. Pfeuffer

©

Hardenburg castle and fortress ruins  © GDKE, U. Pfeuffer

© GDKE, U. Pfeuffer

© GDKE, U. Pfeuffer