Where did it all go? Couldn’t people tell the rock fragments of used for public works, etc. aren’t coming from a traditional quarry? Just seems like a whole bunch of rock waste out there that nobody has ever explained or brought up as far as I know? .... any ideas? This been covered somewhere?
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Good question. How many old cities practically have an underground city below it? Could be old Cold War Continuity of Government facilities. Abandoned missile bases, interestingly some were sold to the public in auction. Abandoned mines. Intersecting underground caves that have no entry point is another possibility. Might not explain it, but all are possibilities.