Fort Laramie Three-Mile Hog Ranch
The Fort Laramie Three-Mile Hog Ranch was built to serve as a social center away from the soldiers' post at historic Fort Laramie, a 19th-century military post in eastern Wyoming. It became notorious as a place for gambling and drinking, and for prostitution, with at least ten prostitutes always in residence.
Source: Wikipedia — Fort Laramie Three-Mile Hog Ranch (CC BY-SA 4.0)