Philadelphia Society for the Preservation of Landmarks

The Philadelphia Society for the Preservation of Landmarks (aka Landmarks) founded in 1931, maintains and preserves four historic house museums in the region around Philadelphia, Pennsylvania, United States. These are: * Powel House * Grumblethorpe * Hill-Physick-Keith House * Waynesborough These are open for the education and enjoyment of the public and its members.

Philadelphia Society for the Preservation of Landmarks

The Philadelphia Society for the Preservation of Landmarks (aka Landmarks) founded in 1931, maintains and preserves four historic house museums in the region around Philadelphia, Pennsylvania, United States. These are: * Powel House * Grumblethorpe * Hill-Physick-Keith House * Waynesborough These are open for the education and enjoyment of the public and its members.