Designed by the New York firm T. Thomas & Son in the mid-1800s, Hay House is a study in fine Italianate architecture prior to the Civil War. The marvelous stained-glass windows and many technological advances, including indoor plumbing, make a tour worthwhile. The home's dining room has recently been restored to its 1870s appearance. Tours depart on the hour. For a small upcharge, you can do the "Top of the House" tour which explores the soaring cupola and widow walk.