Found this[1] as well while poking about - fairly tall structure, unique curved ...

alexhawket · on Nov 15, 2011

If you take the road south from there, there's a giant round bunker like building

jojopotato · on Nov 15, 2011

If you keep following that it looks like the blurry road thing crosses a river and ends in another round bunker.

prawn · on Nov 15, 2011

No obvious parking, otherwise could be employee accommodation of some sort. Hard to tell how narrow those spines are. I'm guessing four storeys tall?