America’s grandest private homes were built for railroad heirs, presidents, industrialists and showmen, and many now belong to foundations, universities and public agencies. Their doors remain open through guided walks, audio tours and behind-the-scenes programs that show how the owners and their staffs lived. Here are twelve historic mansions in America that visitors can still tour today, each confirmed through its official website.
1. Biltmore House: George Vanderbilt’s 250-room chateau
