This web site both promotes and compliments the major traveling exhibition of the same name. Terra Incognita worked closely with the Missouri Historical Society to develop a multiple-phase online project. The first two phases redesigned an existing promotional web site and added dozens of extensive lesson plans. The third phase added a rich online exhibition using the materials developed for the physical exhibition.

The online exhibition provides multiple entries into the subject. An innovative multimedia journey map combines Euro-American and American Indian cartographic traditions to tell the story of the expedition. Visitors can also explore ten thematic exhibits that examine the cultural landscape traversed by Lewis and Clark. Finally, visitors can search through over 350 objects in an artifacts gallery (which can be expanded and updated by the client through a custom administration tool).