This picture was taken in Portland, Oregon. It's the north end of the trolley's tunnel. It's called the Elk Rock Tunnel. Elk Rock is the name of the big rock in the middle of the Willamette River.
				Elk Rock isn't visible in this photo, but it might be if I had a REALLY wide angle lense. This tunnel is about 1/4 mile long and shaped like an S so it's completely dark inside.