I did this image in my spare time to test Corona Volumetrics and iToo Forest Pack Pro.
The structure is an art installation by Sol LeWitt built at Europos Parkas, a museum set in nature in Lithuania.
I created a misty, quite surreal atmosphere, to emphasize the strange presence of the structure in the wild environment.
I stopped the render after 8 hours on a i7-3930K @4.1Ghz.
Hope you like it!