In Glacier National Park, the 17.7 miles Dawson-Pitamakan Passes Trail may be the most beautiful hiking trail in US. I had done it twice. Both time I could finish it with in 10 hours. I strongly suggest others to have experience on that trail in their life time.
http://www.youtube.com/watch?v=-Ly2z-ANbqQ
http://www.youtube.com/watch?v=tPKuE...eature=related
http://www.youtube.com/watch?v=MzYSVyOK4vQ&NR=1
http://www.youtube.com/watch?v=4m-cf...eature=related
http://www.youtube.com/watch?v=SVE_U...BF3C3F&index=4
Hope others can share their favor hiking trails here.