germany the spandau citadel best preserved citadels of the renaissance in europe

ancient antique arch arches architecture archway attractions bastion berlin berlin-spandau brick bricks building buildings castle citadel citadels cobbles cobblestones construction corridor culture defense europe famous fort fortress fortresses gate germany heritage historic historical history landmark medieval monument old one outdoors passage preserved red renaissance sightseeing solid spandau stone tourism travel vault wall zitadelle