The Great Northern mainline crossed the continental divide through Marias Pass, the lowest crossing of the Rockies south of the Canada-US border. Here, the mainline forms the southern border of Glacier National Park, which the GN promoted heavily as a tourist attraction. GN constructed stations at East Glacier and West Glacier entries to the park, stone and timber lodges at the entries and other inns and lodges throughout the Park. Many of the structures have been listed on the National Register of Historic Places due to unique construction, location, and the beauty of the surrounding regions.