Steel supports and struts of a metal device with an old lantern of the Hohenzollern Bridge in Cologne

steel supports struts metal device old lantern hohenzollern bridge cologne industrial structure engineering metallic framework historic architectural elements iron infrastructure landmark architectural detail rivets construction cologne skyline urban transportation bridge german cityscape vintage lantern design ornate hohenzollernbrucke mechanical industrial heritage urban landmark cologne architecture vintage lantern industrial design historic structure steel construction bridge elements decorative support beams cologne landmark bridge architecture metallic framework oldworld charm