Mouths watering yet? The whole point of this investigation is in the title, but before I create a mess of exploded brains plastered to your lovely home's walls, let's start at the beginning.
On Monday, I was lazily flying around New Alexandria, half hoping I would find an Invemy on my own. Ridding myself of such a ridiculous notion, I did what I usually do when on my own in that level; land on the top of random buildings. While doing this, I happened to catch Olympus Tower, aka the ONI building at just the right angle, so that I recognized this outline:
I saw Olympus Tower as a plinth. My next realization was that there are six skyscrapers surrounding the base of the Tower. Four can be seen in the above image, with the two buildings with landing platforms on top making five and six. So where does this lead? Bungie has told us that the Plinths should be in Squidhenge (more definitive proof later), but we need some sort of orientation. So I used the maps in ODST's POGG and Reach's LEG to look for more links, and I have found them.
The annotations should be easy to understand. Also, the six buildings don't look so far away from each other in game. I have attached the NA map to this post for future use. My next step will be to add the various switches from NA to the map, and see if they correspond with anything in District 6.