Mystery Pic-  Concrete Forest
Here's another picture for you to guess what it is.  

If you absolutely want a hint, the first one is on my blog at: http://adventureswithandrea.com/2013/09/concrete-forest/
I have more hints that I'll give in the comments.  I think this is a tough one.  

And this time, +Lisa Co, I didn't give it away in the metadata. :)  
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