This online exhibition focuses on the natural history specimens that were collected by Lewis and Clark on their historic expedition. The site contains images of museum specimens, scientific drawings, and field photos of the plant and animal species observed and described by Lewis and Clark, along with journal excerpts, historical notes, and references for many of these examples as well as the date and location of observation. An interactive collection search allows students to search the specimens by species, date, location, or through the use of an interactive map. A teacher's guide includes standards-based lesson plans and activity ideas for grades 1-12 as well as vignettes that provide additional perspective on some of the plants that were described in the journals of the expedition members.