Kaycee is on Interstate 25, 45 miles south of Buffalo, and 65 miles north of Casper. Take the "Rest Stop" turnoff when you reach Kaycee and drive on Mayoworth Rd for about a miles until you come to Barnum Rd. Drive for about 25 miles and you will reach Hole-in-the-Wall country.
Obtained from a Google search:
Hole-in-the-Wall is a remote pass located in the Big Horn Mountains of Johnson County in northern Wyoming about 25 miles southwest of Kaycee. The name Hole-in-the-Wall is more accurately described as simply a route through the seemingly impassable red wall. The red rock of "The Wall" stretches for miles and miles for as far as one can see in either direction. The site was used frequently from the late 1860s to around 1910 by the Hole-in-the-Wall Gang, a group of cattle rustlers and other outlaws that included the Logan brothers, Kid Curry, Black Jack Ketchum, and Butch Cassidy's Wild Bunch. Cassidy, the Sundance Kid, and other desperados met at a log cabin in the Hole-in-the-Wall country, which has been preserved at the Old Trail Town museum in Cody, Wyoming. The area was secluded, easily defended because of its narrow passes, and impossible for lawmen to approach without alerting the outlaws.
Eventually, the site faded into history, with gangs using it less frequently. At its height, it featured several cabins that gangs used to lie up during the harsh Wyoming winters, and it had a livery stable, a corral, livestock, and supplies, with each gang contributing to the upkeep of the site.