National Park Service, New Mexico.
Exposed to the wind, within a sweeping valley of short grass prairie, amid the swales of the Santa Fe Trail, lie the territorial-style adobe remnants of the largest 19th century military fort in the region. For forty years, 1851-1891, Fort Union functioned as an agent of political and cultural change, whether desired or not, in New Mexico and throughout the Southwest.
Fort Union National Monument is located in the Northeastern portion of the state of New Mexico. 8 miles off of Interstate I-25 on State Highway NM 161. New Mexico: From Albuquerque (156 miles), Santa Fe (94 miles) or Las Vegas, NM (28 miles) take I-25 North, exit 366 at Watrous, 8 miles on NM 161. Colorado: From Denver (313 miles), Colorado Springs (243 miles) or Raton (95 miles) take I-25 South, exit 366 at Watrous, 8 miles on NM 161.