TravelerSouth Dakota, August 2023Show tripAdd to bucket listRemove from bucket listShareJul 31, 2023, 1:49pm ☀️ 82 °F Altitude: 5,285 ft United StatesSouth DakotaPennington CountyKeystoneIron Mountain43.86058, -103.4343843°51’38” N 103°26’4” WDay 2C.C. Gideon tunnel July 31, 2023 in the United States ⋅ ☀️ 82 °F Iron Mountain Road also has some cool, single lane tunnels. 0 likes