beautiful aerial view of olavinlinna, olofsborg ancient fortress, the 15th-century medieval three - tower castle located

above architecture area blue bridge cloud culture drawbridge drone dungeon europe european famous finnish fort historic historical island kuusalmi lake landmark landscape monument museum nature norway olaf olafsborg panorama panoramic photography pihlajavesi reflection river russia saimaa scandinavia sky strengthening stronghold sunrise suomi surface survey sweden swedish tourism travel water