The Outlaw Trail wasn’t really one specific trail, but a series of hideouts that ran from Montana through Wyoming, Colorado, Utah, New Mexico, Arizona, Texas and even into Mexico.
The best-known hideouts included Robber’s Roost in southeast Utah and Brown’s Hole/Park, a tough Colorado canyon area near the Wyoming and Utah borders. But perhaps the best known was Hole-In-The-Wall (see photo), the Wyoming valley surrounded by imposing rock formations with few entrances.
The three areas have been set aside by the federal government. So with some effort, you can still see them as the Wild Bunch did.