Carlheim (also called Paxton) is a mansion located in the northeast part of Leesburg, Virginia. It was constructed in about 1872 for Pennsylvania industrialist Charles R. Paxton (1816–1889) and his wife Rachel who continued to live there until her death in December 1921. When constructed, it sat on over 760 acres (3.1 km2) roughly bounded on the north end by the Red Rock Wilderness Overlook Regional Park, the Balls Bluff Battlefield and the Potomac River. In accordance with Mrs. Paxton's will, the buildings and 50 surrounding acres were preserved and organized into a charitable trust to benefit "needy children."