From a distance, this gas station looks a little like a blue castle tucked between a Wendy’s and a McDonald’s. It is a Kentucky County Music Museum, hidden inside an Exxon/Baskin Robbins located on Highway 23, also known as “County Music Highway.” You might stop for gas on the outskirts of Lousia, Kentucky and not notice the two 10-foot-tall guitars outside, one painted for Townes Van Zandt, another with Hasil Adkins, whose home in Boone County, West Virginia is just over the state line on the other side of the river. You…