John Johnson House (Philadelphia, Pennsylvania)
The John Johnson House (also known as the Johnson House) is a National Historic Landmark in the Germantown section of Philadelphia, significant for its role in the antislavery movement and the Underground Railroad. It is located at 6306 Germantown Avenue and is a contributing property of the Colonial Germantown Historic District, which is also a National Historic Landmark.
Source: Wikipedia — John Johnson House (Philadelphia, Pennsylvania) (CC BY-SA 4.0)