canada cliff falls height high long mist narrow national park ribbon rock spray Takkakaw vapour water waterfall Yoho ancient arch architecture autumn castle castles defence defense door fall gate medieval protection rocks secure security trap trapdoor blue cloud current flow force Huka Falls lake natural nature new zealand pour sky Taupo tree water resources watercourse white drop forest gorge green melt norway norwegian power snow trees violent dangerous fast fierce kjosfossen powerful raging thunderous clean clear cold fresh indian summer long exposure moss mossy Mountain Creek river turquoise descend freezing frozen glacier ice landscape mountain Rockies Rocky Mountains slide cachoeira cascade cascata chapada natureza paisagem pedra rio track trial trilha vale água