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Just a google maps pic since there's nothing really to see from the ground.
This is the outline of Birch Aerodrome, a WW2 military airfield that has been returned to agricultural land. The runways are still there and used as access roads for tractors now. Where the hangers were has been replaced by barns for said tractors.
There's loads of these all over East Anglia UK since it was the most convenient place for launching fighters and bombers to the continent. Most of them aren't marked on maps but you can spot their shape pretty easily.
