This 16-mile barrier island is home to some of the most elegant and extravagant mansions in the country. Don’t miss Whitehall, a true American castle. Built by Henry Morrison Flagler and now known as Flagler Museum, this home stands as a testament to life in the Gilded Age and Flagler’s impact on Florida history. But this notable landmark is just part of why this destination has maintained its refined elegance for more than a century. For superb shopping, the incomparable Worth Avenue shares the marquee with other elite locales, such as New York’s Madison Avenue and Beverly Hills’ Rodeo Drive.