The Lewis & Clark:The National Bicentennial Exhibition opens at the Denver Museum of Science and Nature on May 6. "Featuring hundreds of rare artifacts and documents, brought together for the first time in two centuries, the exhibition is a timely tribute to a band of intrepid explorers and their legendary expedition." Also, Lewis & Clark: Great Journey West IMAX opens May 6. This exhibit is traveling around the country, but is in Denver until the end of August.