Designed by Dr. William Thornton, architect of the Capitol, Tudor Place was constructed between 1796 and 1816 for Martha Parke Custis, George Washington’s step-granddaughter. Family descendants lived here until 1983. Tours of the garden and house are currently self-guided, though docent-led tours of the house may be available by the time you visit (check the website for updates). Tudor Place is free to visit (though donations are accepted), but you’ll need to reserve a ticket in advance—call or book one online. See the Tudor Place stop on the Georgetown self-guided walking tour