The first building constructed at Fort Yellowstone was the guardhouse (Bldg 9) at the southwest corner of the fort. In 1891, visitors traveled the lower Mammoth road through what is now the main residential area for park personnel. The guardhouse was the first building they encountered in the Mammoth area and there was always a sentry on duty to check visitors entering the park. The building is now a private residence. The original fort administration building (Bldg 8) was located immediately next to the guardhouse and is now also a private residence. Of the twelve buildings constructed in 1891, the most prominent are two of the four double officers' quarters (Bldgs 6 and 7) which front the old parade ground. Other buildings constructed in 1891 included a 60-man barracks, a commissary storehouse (Bldg 10), a quartermaster storehouse (Bldg 11), a granary (Bldg 12), a bakery (Bldg 24), a stable (Bldg 25) and the first two of four non-commissioned officers' (NCO) quarters (Bldgs 30 and 33). These NCO quarters became known as "soap-suds row' because many of the NCO wives were former army laundresses who supplemented their husbands' income by doing laundry for post personnel.