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Pick up the freedom journey of the Underground Railroad through South Mountain just south of the Mason Dixon Line. Many escaping enslaved used the Potomac River to move closer to the safe houses of the north. Knoxville, MD, located along the Potomac River and adjacent to the Appalachian Trail, is a good point of access to the natural travel corridor of the South Mountain, passing from Maryland into Pennsylvania. Download a South Mountain Self-Guided Freedom Drive (.pdf).