View of the Akershus Fortress from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

akershus fortress oslo norway historic site architecture scandinavian landmark sunny day medieval structure tourist attraction fortress walls scenic view castle history sightseeing european heritage green space cultural landmark cityscape tourism outdoor landscape nature vibrant historical architecture visiting oslo exploration travel destination castle grounds panoramic view beautiful day nordic culture ancient walls tower landmark view urban landscape culture outdoor activities scenic architecture beautiful scenery travel europe holiday destination history lovers cultural exploration tourism highlights travel scenery heritage site historic milestone architectural beauty blue sky green surroundings