There is an undeniable air of the freak show when you first enter the Texas Prison Museum in Huntsville, located just a few miles from The Walls, the state’s oldest penitentiary. The building smells overwhelmingly of high-quality handmade leather goods, which sit in the gift shop next to the sparkling belt buckles you find in larger tourist stops across Texas. The star attraction in the museum is an actual electric chair that was used to execute…