The two tunnels on the abandoned section of the Pennsylvania Turnpike. One is about 3,800' and the other about 5.400'. Neither are lit. A very bright headlamp was sufficient. To keep orientation, I simply followed the old median stripe that is still visible. The temperature outside was in the 80s. Inside it was about 55-60. The hope is to one day turn as much of the right-of-way as possible into an "official" bike path. If you ever ride PA Bike Route S, the right of way is a great way to avoid a nasty climbing section heading east from Breezewood.

One of the tunnel portal areas was used in the post-apocalyptic film "The Road" starring Viggo Mortensen. Very fitting.