Marble House includes Marble House and many other historic Newport mansions, was added to the Register on December 8, 1972 and subsequently designated as a National Historic Landmark District on May 11, 1976. Marble House is one of the earliest examples of Beaux-Arts architecture in the United States, with design inspiration from the Petit Trianon at the Palace of Versailles. Jules Allard and Sons of Paris, first hired by the Vanderbilts to design some of the interiors for their Petit Chateau on Fifth Avenue in Manhattan, designed the French-inspired interiors of Marble House. The grounds were designed by landscape architect Ernest W.
Palace of Versailles and more graceful neoclassical Louis XVI style of the Petit Trianon, completed by Ange-Jacques Gabriel in 1768. The palace was largely completed by the death of Louis XIV in 1715. The eastern facing palace has a U-shaped layout, with the corps de logis and symmetrical advancing secondary wings terminating with the Dufour Pavilion on the south and the Gabriel Pavilion to the north, creating an expansive cour d'honneur known as the Royal Court (Cour Royale). Flanking the Royal Court are two enormous asymmetrical wings that result in a facade of in length. Encompassing the palace has 700 rooms, more than