Not much to go on from such a small photograph. From how shallow it is it resembles something like a cistern or a well-built outhouse pit. Those types of things have a tendency to collect junk. There are some other structures it could be depending on how much of it remains covered. Whatever it is it was most likely left in place because getting rid of well-built brick structure is hard, to say nothing if it uses rebar. You'll most likely leave it in place for the same reason, and another person fifty years hence can ask the same question and history may repeat.
Danth
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