A narrow outside walkway between cell blocks at Eastern State Penitentiary in Philadelphia Pennsylvania. The prison was built in 1829 and closed in 1971.

I had hoped for a more featureful sky but that is not what Mother Nature had provided.

Technical details:
Sakai Toyo 5x7" large format metal field camera with 4x5" film back.
150mm Caltar-S II F 5.6 lens in Copal BT shutter.
Ilford FP4+ B&W film, shot at ISO 125.
Exposure was 1/4 second at F32.
Developed in Rodinal/Adox Adonal 1:50 dilution for 15 minutes @ 20 degrees Celsius in Mod54 daylight developing tank.
4x5" negative scanned with Epson V600.