The service door at the back of building # 17 at Norristown State Hospital in Montgomery County, Pennsylvania. The structure was built in the 1880s and abandoned since the 1960s.

Technical details:
Sakai Toyo 5x7 large format metal field camera with 4x5 film back.
90mm F5.6 Schneider Super-Angulon lens in a Copal 0 shutter.
Kodak Ektascan BR/A single-sided X-Ray film shot at ISO 100.
Exposure was 1/30 second at F22.
Developed in Rodinal/Adox Adonal 1:150 dilution for 7 minutes @ 20 degrees Celsius in Mod54 daylight developing tank.
Negative scanned with Epson V600.