Set against North Carolina's Blue Ridge Mountains, George Vanderbilt's 250-room chateau-style Biltmore Estate ranks as the largest private home in America.
At the Green Animals Topiary Garden in Portsmouth, Rhode Island, more than 80 plants (including California privet, yew, and English boxwood) have been clipped to resemble mammals, birds, and geometric shapes.
Biscayne Bay glitters just beyond the 10 acres of European-inspired gardens and native forest at Miami's Vizcaya, an opulent, European-style villa built in 1916 as a winter home for agricultural industrialist James Deering.
Built in 1923, Milwaukee's Villa Terrace was once owned by Lloyd Smith, president of the A.O. Smith Corporation.