Follow U.S. 301 North. After crossing the Harry Nice Bridge at Dahlgren go right at the 2nd traffic light onto Rt. 234 South. Rt. 234 will merge with Rte. 5.Travel on through Leonardtown and continue for approximately 20 miles until you reach St. Mary's City. You will see a sign welcoming you to St. Mary's City then the St. Mary's River on the right as you enter the St. Mary's College of Maryland campus.
Look for Rosecroft Road on the right. Take Rosecroft Road, and then take first right (Hogaboom Lane) to the Visitor Center.