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.
Trianon (sorority) girls whose principles revolted against fraternities into which only a selected few were bidden and whose dues and fees were outside the limit of the average girl's allowance"" (Trianon Key). Trianon employed an open membership policy; interested students completed a formal application (Trianon Key). Throughout the 1930s, the members of Trianon worked to create official symbols, insignia, rituals, bylaws, and policies. An alumna club and a mother's club were created in 1933 (Trianon pledge manual). In 1938, however, the Miami chapter struggled to recruit new members; "...several years later it [Miami] had depreciated so in value that the national organization