The Old South Mountain Inn in Boonsboro, Maryland, is rumored to be haunted by a ghostly cat that visits guest rooms, and visitors have reported hearing the sound of a bell. The inn itself has a long and varied history, serving as a stagecoach stop and a Civil War-era site before its transformation into a restaurant and event venue, which was later purchased by the State of Maryland in 2023 to become a visitor's center. One of the main rumored spectral residents is a ghostly cat that is said to linger at the inn. Guests and witnesses have reported hearing the sound of a bell within the inn. The original building on the site dates back as early as 1732. The inn's location was significant during the Civil War, being connected to the John Brown Raid on Harpers Ferry and the Antietam Campaign. Prominent figures, including President Daniel Webster and Henry Clay, visited the inn.