IMAX: America's Star Attractions - Grand Canyon/ Yellowstone

Grand Canyon: The Hidden Secrets:
Through the startling reality captured by IMAX film technology, this spectacular National Geographic video takes you on a journey spanning 4,000 years of human history including the dramatic re-creation of the 1869 Powell Expedition. Experience the exhilaration of clinging to a fragile raft as it is swept through what are said to be the most treacherous rapids in the northern hemisphere