A lot of the “mounds” we have today are man built, it’s far easier to tear a few walls and fill up the rest than to completely demolish a building and remove the rubbish.
So many cities have been built upwards, even in modern times the average street level of large cities have increased, this is in many cases how we got “lower ground floors” in many cities where those ground floors used to be at or about the street level, but when modern infrastructure such as more plumbing, gas, electricity and roads that can support trucks and busses rather than just horses and carriages were required we have to build up.
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