Hidden City Tour 2013 03 17 on Flickr. Via Flickr: Legally exploring four abandoned buildings in the Germantown section of Philadelphia under auspices of Hidden City Philadelphia. Luminance HDR 2.3.0 tonemapping parameters: Operator: Reinhard05 Parameters: Brightness: -10 Chromatic Adaptation: 0 Light Adaptation: 1 —— PreGamma: 1