Charcoal Pits and the Iron Industry in the NW Corner. Join us and co-hosts The Warren Historical Society to learn about one of our region’s most important industries as we walk through the woods to the site of two charcoal pits. Total walk is 2.5 miles (or 2 miles to first site and back) over moderately challenging terrain. Park at Town Hall. You bring your water bottle, and we’ll provide the trail mix cookies!