US-24 TN Pass Sinkhole
  This sinkhole developed when a 100 year old abandoned railroad tunnel collapsed.
  https://www.codot.gov/business/designsupport/materials-and-geotechnical/programs/geohaz/assets/us-24-tn-pass-sinkhole/view
  https://www.codot.gov/business/designsupport/materials-and-geotechnical/programs/geohaz/assets/us-24-tn-pass-sinkhole/@@download/image/TN_Pass.jpg
            
              US-24 TN Pass Sinkhole
            
            
            
              This sinkhole developed when a 100 year old abandoned railroad tunnel collapsed.