there since 1971. (17) On January 20, 1961, the Modoc Rock Shelter was declared a National Historic Landmark. (18) In 1973, the Creole House in Prairie du Rocher was added to the National Registry of Historic Places. (19) In 1974, Prairie du Rocher and the French Colonial Historic District, an area of 22 square miles, was created and added to the National Registry of Historic Places, along with the ancient Kolmer Indian site. (b) Purposes The purposes of this Act are to— (1) recognize the importance of Prairie du Rocher and the French Colonial Historic District as a nationally significant architectural village of the cultural heritage of the United States