Gran Quivira Ruins are 26 mi. s. of Mountainair off SR 55. Historians estimate that at its height the Gran Quivira pueblo was home to more than 2,000 people. Some 20 limestone house mounds date from 1300 to about 1670; approximately 300 rooms and six kivas can be explored. Also preserved are the 17th-century ruins of San Isidro and San Buenaventura.