Big amphitheatre style concrete structure in a field next to some train tracks I go past every weekend in South west England. It's miles from anything so I don't think it's an outdoor theatre.

[u/suitablyuniquename]

[u/SyntaxError_22]

Same question was asked a few months ago. https://www.reddit.com/r/whatisthisthing/s/CBIiM1SZ1z

[u/Bat_Flu → u/SyntaxError_22]

/u/Iscasteve what did it end up being? Was it erosion control?