stack of old oxidized cannon balls on top of a rock pillar against a sunny blue sky, oscarsborg fortress, historic ww2 site in nor

background bak balls blue cannon cannonball copy corrosion county defense dracedil europe fortress historic iron islands kaholmen metal narrow norway norwayn old oscarsborg oxidation oxidized pillar rock scandinavia season site sky sound space stack stacked stone summer sunny top tourism travel vacation viken war world ww2