Chiswell's Inheritance, also known as Chiswell's Manor, Chiswell's Delight and Grayhaven Manor, is a historic home located at Poolesville, Montgomery County, Maryland, United States. It is a two-story, five-bay brick plantation house with an attached kitchen wing on the south end. Inlaid in glazed brick near the peak of the gable is the inscription "C S" with the date "1796" below.