Empire mansion open to the public in Norwalk, Connecticut Mark Twain House: the American High Gothic style house where Samuel Langhorne Clemens (Mark Twain) and his family lived from 1874 to 1891 in Hartford, Connecticut. Loomis Homestead: one the oldest timber-frame houses in America in Windsor, Connecticut. Delaware Hagley Museum and Library: the Brandywine Valley home of Eleuthere Irenee du Pont in Wilmington, Delaware Nemours: the 300-acre French estate of Alfred I. du Pont in Wilmington, Delaware Winterthur: the fifth largest residence in America was home to industrialist Henry Francis du Pont in Winterthur, Delaware District of Columbia Dumbarton Oaks: the mansion of Robert Woods Bliss in Washington, D.C. The White House: designed by James Hoban in the Palladian style, it is the official residence and workplace of the president of the United States. The Wylie Mansion: the former residence of judge Andrew Wylie in Washington, D.C. Florida Cà d'Zan: John Ringling mansion, Sarasota, Florida Mar-a-Lago: a mansion and estate in Palm Beach, Florida; the former residence of Marjorie Merriweather Post and Edward F. Hutton; the current residence of Donald Trump; it was added as a National Historic Landmark in 1980. Villa Vizcaya: James Deering mansion, Miami, Florida Whitehall: the estate of Florida developer and Standard Oil partner Henry Morrison Flagler in Palm Beach, Florida. Georgia Margaret Mitchell House and Museum: the house where Margaret Mitchell wrote Gone with the Wind Illinois Glessner House: Chicago, H. H. Richardson, architect Hull House: Jane Addams' settlement house for immigrants and the poor in Chicago, Illinois Robie House: Frank Lloyd Wright-designed residence, Chicago, a U.S. National Historical Landmark Louisiana Laura Plantation: a Créole-style historic plantation in St. James Parish, Louisiana, on the West Bank of the Mississippi River near Vacherie, Louisiana Oak Alley Plantation: a historic plantation located on the Mississippi River in the community of Vacherie, Louisiana; residence of Jacques Telesphore Roman. St. Joseph Plantation: a historic plantation located on the west bank of the Mississippi River in the town of Vacherie, Louisiana; residence of Josephine Aime Ferrie Maine Bush compound: the summer home of U.S. President George H. W. Bush located adjacent to the Atlantic Ocean in southern Maine, near the town of Kennebunkport; the mansion was purchased by St. Louis banker George Herbert Walker and has remained as a summer retreat for the Bush family for over a century. Wedding Cake House: the Gothic revival mansion of ship captain George