Landmarks has an interesting history of its own. In 1931, roused by the news that the historic Powel House was to be demolished in six weeks, Frances Anne Wister and Sophia Cadwalader and a group of strong supporters (including famous names like Biddle, Barnes, Curtis and Lippincott) founded Landmarks to save the house. The newly formed Landmarks was successful despite the economic depression of the time and within another ten years had acquired Grumblethorpe in Germantown. In the late 1960s, Ambassador and Mrs. Walter Annenberg restored the stately Hill-Physick-Keith House and then donated the house to Landmarks. In 1981, Landmarks entered into an agreement with Easttown Township in Chester County, Pennsylvania to administer Historic Waynesborough.