One of two tunnels on the Allegheny River Trail between Franklin and Emlenton, PA:




At home I think I have some shots of one of the tunnels on the abandoned stretch of Pennsylvania Turnpike that I rode last year. They are a fun ride. The easterly tunnel is over a mile long. It is not lit and there is a crown closer to the eastern portal so when you enter it from the west, you literally cannot see the light at the end of the tunnel.