Sideling Hill Tunnel, Pennsylvania Turnpike - one of 7 tunnels opened in 1940 as part of the nation's first super highway. At over a mile long, this was the longest tunnel. It is abandoned to all but hikers and bikers today.
Sideling Hill Tunnel, Pennsylvania Turnpike - one of 7 tunnels opened in 1940 as part of the nation's first super highway. At over a mile long, this was the longest tunnel. It is abandoned to all but hikers and bikers today.
Sideling Hill Tunnel, Pennsylvania Turnpike - one of 7 tunnels opened in 1940 as part of the nation's first super highway. At over a mile long, this was the longest tunnel. It is abandoned to all but hikers and bikers today.
