Summary: Through th estartling reality captured by Imax film technology, this spectacular video takes you on a journey spanning 4000 years of human history, including th edramatic re-creation of th e1869 Powell Expedition. Experience the exhilaration of clinging to a fragile raft as it is swept thorugh what are said to be th emost treacherous rapids in the Northern Hemisphere the thunderous whitewaters of the might Colorado River. Savor the quitesolitude of soaring silentyly through the majestic monoliths towering nearly a mile over the Canyon's floor in a tiny ultralight aircraft.