Back in 2007 I visited the Vemork hydroelectric power plant located Rjukan, Norway.  For Norwegians the plant is best known for the heavy water sabotage against it during world war 2.  My attention was drawn to one of the side walls of the old building.  It was nicely textured with a beautiful old door.  I recently re-processed the picture of the door using Silver Efex Pro.  Here's the resulting image:

Vemork / Rjukan, Norway, 2007