castle harburg stronghold by blue sky

ages ancient architectural architecture attraction backdrop bastion blue bombproof building bulwark burg cannonproof castle century circular complex defence defense defensive destination encircled enclosure europe european exterior forces fortification fortified fortress german germany grounds harburg heritage historic historical history knight knights landmark landscape medieval middle military old outside protection rampart reichsburg residence safe scene scenery secure securing sight site sky solid spot staufer stonewall stronghold structure tourism tourist touristic wall thickwalled copy space