From beneath the 90-foot portico of Mount Vernon, visitors can gaze across an expanse of sloping lawn to the Potomac River, a mile wide, as its flows past George Washington's home. Costumed guides narrate the history of the elegant mansion and of the surrounding buildings, which have been preserved to reflect the days when the first president resided here. Visitors are invited to walk around the 500-acre estate, tour the buildings and participate in the 'Hand-on History' exhibits that recreate farming techniques and colonial games.