The history of the 200-year-old Ohio National Road is the featured exhibit through May. Learn about the "Road that Helped Build America."  The National Road in Ohio is 227.87 miles long. It enters Ohio at Bridgeport and exits the state near Richmond, Indiana, traveling through Belmont, Guernsey, Muskingum, Licking, Franklin, Madison, Clark, Miami, Montgomery, and Preble counties. In some places, the original road was bypassed by subsequent U.S. 40 construction, which varied from two to four lanes.  In eastern Ohio, many old Road segments still pass through Pike towns and along hilltops and ridges. Others are entirely abandoned and are isolated artifacts on the landscape. Occasionally, the Road includes U.S. 40’s successor, I-70. Until it reaches Zanesville, the National Road may also occasionally encompass or parallel the route of an even earlier road, Zane’s Trace.