What's behind door # 1 ?

A barn door holds behind it unknown secrets, and probably a few mice, at the Kutztown German Heritage Center on the campus of the Kutztown University in Kutztown, PA. 

Shot with a Nikon D7000 and Nikon 35mm F1.8 AFS G prime lens.  Aperture priority mode, F9, ISO 200, center weighted metering, hand held.   Processed in Lightroom 4.