>>1295719Never seen anything like this. Building technique reminds me of pre-radar military installments in UK.
More about 'sound mirrors' here:
https://en.wikipedia.org/wiki/Acoustic_mirrorhttp://www.subterrain.org.uk/soundMirrors/That big thing sticking out looks like it once supported a conveyor to fill up barges. It's a silo, built when aluminium was too expensive for this kind of construction.
Steel brackets near the top were probably attached to an array of chains or wire cable to make structure stronger. Reinforced concrete of that thickness alone would not be strong enough for anything heavier than dust.
