A set of stairs lead up to one of the corner guard towers at Eastern State Penitentiary in Philadelphia, Pennsylvania.  The prison was built in 1829 and closed in 1971 remaining abandoned for several decades before being re-opened to the public as a history museum.

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.
Yellow # 8 filter on lens to help with contrast.
Kodak Ektascan BR/A single-sided X-Ray film shot at ISO 100.
Exposure was 1/4 second at F32.
Developed in Rodinal/Adox Adonal 1:150 dilution for 7 minutes @ 20 degrees Celsius in Mod54 daylight developing tank.  
4x5" negative scanned with Epson V600.