The National Frontier Trails Museum is devoted to four great western routes: the Lewis and Clark; Santa Fe; Oregon; and, California Trails. The Merrill J. Mattes Research Library--perhaps the nation's largest collection of rare books, documents, and diaries solely about the westward movement--is open by appointment to the public. Visitors enjoy an award-winning film; exhibits including covered wagons, trail artifacts, original diaries and letters; and a ‘pack-your-wagon’ hands-on activity for youths . . . all devoted to showcasing westward expansion’s impact on American history. North of the museum is an authentic train depot interpreting the end of the trails, saved from demolition and relocated to this site. Beyond the depot and across the railroad tracks, lies the headwaters of a mighty fresh-water spring that 19th century travelers could partake as they rolled on their southwesterly route. The spring, buried by rubble from a tragic fire when the Waggoner-Gates Mill exploded in the 1960s, is planned to be re-excavated for future interpretation.