In terms of architecture, interiors, mechanical systems, road systems and landscape, the Vanderbilt Estate is a remarkably complete example of a gilded-age country place, illustrating the political, economic, social, cultural, and demographic changes that occurred as America industrialized in the years after the Civil War. The fully-furnished, 54-room mansion in Hyde Park, New York is placed in a wondrous landscape with breathtaking views of the Hudson River and distant Catskill Mountains. It offers a glimpse into a past world known by only an elite few. Leashed pets are permitted in the park, but are not allowed in the buildings. Leashes must be no longer than six feet.