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 drop force forest gorge green melt natural nature norway norwegian power snow trees violent dangerous fast fierce kjosfossen pour powerful raging thunderous blue clean clear cold fresh indian summer long exposure moss mossy Mountain Creek river turquoise descend freezing frozen glacier ice lake landscape mountain Rockies Rocky Mountains slide cachoeira cascade cascata chapada natureza paisagem pedra rio track trial trilha vale água path queda