Looks like a chimney surrounded by a skeleton scaffold. you can see the gaps in the surround in the shadow on Bing Maps Aerial View as it's higher resolution:
You can see the way the structure inside zigzags up, like a flight of fire escape stairs, or stairs commonly seen on blast furnace towers of metalworks factories.
if it is a chimney then there's a not so top secret base deep under that
You can see the way the structure inside zigzags up, like a flight of fire escape stairs, or stairs commonly seen on blast furnace towers of metalworks factories.
if it is a chimney then there's a not so top secret base deep under that
