By Ronni Smith NASHVILLE, TN — Most people aren’t aware of the history in some of their favorite places. For visitors to Dunbar Cave in Clarksville, Tennessee, that’s all changed. Last summer, the area got an historical marker dedicated to the site of what was formally known as Affricanna Town, a small encampment of recently emancipated Black Americans that existed from around 1864-1867. Dunbar Cave’s park manager, David Britton, told its story. A refugee camp founded by formerly enslaved people in the area, the site’s residents probably came from two nearby plantations belonging to the Barker and Warfield families. Britton…