Flickr user kumpel kante presents a gorgeous build featuring ruins (a personal favorite) of ancient civilizations, re-purposed for more nefarious uses.
There are tons of great details hidden amongst the ruins. I invite you to spend some time looking at the great architecture and sculpting he used to create this!
I believe my favorite feature of this is all those glorious studs exposed. This is a great example of the fact that not everything needs to be SNOTted and covered in tiles to be a beautiful, effective build. Bravo.