It’s underground now, but that was their ground level when they built it.
Ground level rises. Out in nature, where the wind carried dirt particles over long distances, it rises by a couple centimeters per century.
In cities, where you need to dig out a giant hole for any construction project, not to mention in ancient times there was no plumbing or garbage collection, only a giant hole you dug in the backyard, it rose waaaay more.
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