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some think this underwater pyramid in japan is the oldest man made structure.
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I've watched a documentary on this location and many people think it's actually a natural formation and has not been altered by man in any way. There are a number of locations where the actions of waves and other natural phenomenon do tend to shape rock into formations with straight lines and other features that often appear as man made but in fact they are not. We would need some evidence such as tool marks to show that this is indeed a man made site.