I think this might be a private converted mesh. Could you link me to where you found this picture?
Otherwise, Maybe take a look around the forum & deviantart? maybe you'll find a mesh similar to this ^^
I would link you, except it's a screenie I took in a map pack I was in earlier.
I don't know if it's private, because my friend has the mesh after looking for it as well.
I hope I can find it, though. Will come in helpful with fantasy maps.
Thanks for your input/help!