Imperial Palace bridge with reflection on water in Tokyo, Japan, overcast sky, weeping willow tree in foreground

japan tokyo imperial palace nijubashi bridge reflection water historical architecture overcast weeping willow travel culture landmark stone bridge moat city tourism asian tranquil heritage traditional royal chiyoda capital city urban outdoor cloudy sky serene japanese garden fortress sightseeing nature greenery iconic edo destination peaceful structure elegance historical site japanese culture famous place cityscape calm touristic bridge view foliage exterior grandeur