2025-08-06 00:00:00 Learn about District of Columbia's important and irreplaceable historic places and spaces. DC Historic Sites is based on the DC Inventory of Historic Sites, the city's official list of properties deemed worthy of recognition and protection for their contribution to the cultural heritage of the city, the nation’s capital, and the nation. DC Historic Sites was developed by the DC Preservation League, Washington's only citywide nonprofit dedicated to the preservation, protection and enhancement of the historic resources of our nation's capital. www.dcpreservation.org