 The Argo Tunnel drained and provided access to many lodes of ore between Idaho Springs and Central City.During the late twentieth century, the town evolved into a tourist center along U.S. Highway 6 and U.S. Highway 40, which ascend Clear Creek Canyon through the historic mining district.The town today is squeezed along the north side of Interstate 70, with a historical downtown in the central portion, a strip of tourist-related businesses on its eastern end, and mostly residences on its western end.