Lewis and Clark in North Dakota
This web site contains information about Lewis and Clark's expedition, with a special emphasis on historical sites in North Dakota that you can visit today.  There are plenty of pictures and maps as well as a trivia section. From the North Dakota Travel and Tourism web site.

PBS Online: Lewis and Clark
This web site contains biographical and historical information about the Lewis and Clark's expedition, including pages on many of the Native tribes they met along the way.  Also, historians discuss their ideas about the expedition's historical significance. From the American History section of the PBS Online website.

Lewis and Clark National Historic Trail
This web site site offers a brief history, links to US government and state sites dedicated to portions of the Lewis and Clark trail, maps of the expedition’s route, a newsletter, and more.

The History of the Lewis and Clark Expedition
From the Lewis and Clark Trail Heritage Foundation web site.

The Ethnography of Lewis & Clark
This web site is an online exhibit of ethnographic objects believed to have been collected during Lewis and Clark's expedition.  The site also includes a map of their routes and a list of related links. From Harvard University's Peabody Museum web site.

Lewis and Clark on the Information Superhighway (Full List of Links)
Here's a page of over 400 links to online information about Lewis and Clark.  From the Virtual Professional Development School of Washington State University.