The Thomas Stone National Historic Site, also known as Haberdeventure or the Thomas Stone House, is a United States National Historic Site located about 25 miles (40 km) south of Washington D.C. in Charles County, Maryland. The site was established to protect the home and property of Founding Father Thomas Stone, one of the 56 signers of the United States Declaration of Independence. His home and estate were owned by the Stone family until 1936.

Charles County is a county located in the U.S. state of Maryland. As of the 2020 census, the population was 166,617. The county seat is La Plata. The county was named for Charles Calvert (1637–1715), third Baron Baltimore. Charles County is part of the Washington metropolitan area and the Southern Maryland region.