Director Bruce Neibaur's dramatic recreation of the epochal Lewis and Clark expedition an undertaking that was in its day (1803-1806) equivalent in difficulty and danger to a trip to the moon represents a truly spectacular use of the IMAX format. All history lessons should be as enthralling. Filmed mostly on the actual locations, the film chronicles the expedition's 8000-mile journey from the mouth of the Missouri River to the Pacific Ocean and back, across a wilderness that only Native Americans had ever seen. Along the way, they identified and catalogued hundreds of plant and animal species and basically changed the course of America's history. Screen...