Reichu: That weird-looking structure on the right is called the “Subterminal,” but I have no idea what it's for.
HeWhoPostsStuff: Maybe it's the broadcast tower for the mega-popular KNRV, Radio Nerv, playing the latest hits 24/7, to make sure that the populace doesn'tnotice all the gigantic rampaging critters wandering around!
Mr. Tines: In contrast to all known conspiracy literature, this pyramid does not have an eye near the crest on one side in any of the views we see.