District of Columbia Inventory of Historic Sites

The District of Columbia Inventory of Historic Sites is a register of historic places in Washington, D.C. that are designated by the District of Columbia Historic Preservation Review Board (HPRB), a component of the District of Columbia Government. == Historic Preservation Review Board == The District of Columbia Historic Preservation Review Board (HPRB) designates historic structures and districts and advises the mayor of the District of Columbia on historic preservation matters.

Source: Wikipedia — District of Columbia Inventory of Historic Sites (CC BY-SA 4.0)