From the record
“Bandelier National Monument is a 33,677-acre (136 km2) United States National Monument near Los Alamos in Sandoval and Los Alamos counties, New Mexico. The monument preserves the homes and territory of the Ancestral Puebloans of a later era in the Southwest.”
Wikipedia article Bandelier National Monument, CC BY-SA 4.0.
One of 8 National Register listings published here for Los Alamos County · listed in 1987 · category: District · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article

