Enjoy a Day of Fun and Learning at this 18th Century Plantation. The Keith House at Graeme Park is a National Historic Landmark built c. 1722 as the summer home of Sir William Keith, then Governor of Pennsylvania. The Georgian style mansion was later owned and updated by Dr. Thomas Graeme and, during the Revolution, the writer Elizabeth Graeme Fergusson called the estate home. Learn about life on an 18th century country estate and about the lives of the owners…