New York's Gilded Age produced a glittering stretch of mansions along Fifth Avenue, built in the late nineteenth and early twentieth centuries as bold displays of wealth and ambition. While many of these extravagant homes were demolished in the nineteen twenties and later decades due to high maintenance costs and redevelopment, a significant number still stand, offering a glimpse into a period defined by opulence and social rivalry.

Among the survivors is Andrew Carnegie's former residence, now the Cooper Hewitt Smithsonian Design Museum, and the Henry Clay Frick House, today the Frick Collection, which houses masterpieces in the setting originally intended for them. Other notable buildings include the Fabbri Mansion, now the residence of the Japanese ambassador to the United Nations, and the former home of Stuyvesant Fish, currently headquarters for Bloomberg Philanthropies.

The Harry F. Sinclair House, now home to the Ukrainian Institute of America, remains one of the most ornate examples of the era's taste for European inspired grandeur. Though many famed residences such as the Vanderbilt Petit Château and the William A. Clark mansion have vanished, enough endure to allow visitors to trace the legacy of 'Millionaire's Mile' and experience the architectural ambition that once defined Gilded Age New York.