The mountains and deeply wooded valleys of Northwest Arkansas have a mysterious side to match their pristine beauty. Eureka Springs is home to more than a few hotel guests who have never checked out. The lingering spirits of fallen Civil War soldiers are said to haunt the battlefields of Pea Ridge and Prairie Grove. Many former patients of sadistic doctor Norman Baker are believed to roam the grounds of his former hospital, now the Crescent Hotel. Elkhorn Tavern, a well-known stop on the historic westward thoroughfare, is still plagued by lingering apparitions from its days as a field...