Register of Culturally Significant Property

The Secretary of State's Register of Culturally Significant Property (Secretary's Register) is an honorific listing of diplomatic properties that figure prominently in the international or architectural heritage of the United States. It was founded in 2000 as a White House Millennium Project, in equation of the National Register of Historic Places for domestic properties maintained by the Secretary of the Interior.

Source: Wikipedia — Register of Culturally Significant Property (CC BY-SA 4.0)