National Register of Historic Places

The National Register of Historic Places (NRHP) is the United States federal government's official list of sites, buildings, structures, districts, and objects deemed worthy of preservation for their historical significance or "great artistic value".
The enactment of the National Historic Preservation Act (NHPA) in 1966 established the National Register and the process for adding properties to it. Of the more than one and a half million properties on the National Register, 100,000 are listed individually. The remainder are contributing resources within historic districts.