Dutch doors are among our favorite features in old homes. Also known as split, double-hung, or half doors (or in Dutch, boerendeur, meaning "farm door"), the interesting entrances date back to the 17th century. Divided horizontally so that the top and bottom portion of the portal can be opened independently, Dutch doors allow for open airflow while still providing a barrier. Whether you're installing an interior or exterior Dutch door, get inspired by these charming designs.