16. Bandelier National Monument is in Los Alamos, New Mexico. Los Alamos is famous for its national laboratory where the first Atom bomb was designed. Bandelier National Monument has ruins of ancient Anasazi cliff houses and houses of Pueblo People. Plan to spend a whole day there and take trails to see some wonderful excavated sites, rock paintings and Petroglyphs. People have reported bear sightings there, so be careful while taking trails.