During a recent trip to Roswell, New Mexico, Insider visited Whataburger, the Texas-based fast-food chain that you can only find in the southeastern and southwestern United States. Whataburger was founded in 1950 as a modest hamburger stand in Corpus Christi, Texas.  Today, there are more than 800 Whataburger locations nationwide, with over 600 in the Lone Star State.