As for evidence of advanced civilisations, should we consider the anomalous presence of structures here on Earth?

Apart from a Sphinx that exhibits rain-caused weathering that implies a date far in excess of 4500 years age, or the weathering ridge around the Great Pyramid where the limestone facing used to be, or the sophisticated working of granite by a civilisation we claim to have had only copper or at best bronze tools, there's structures around Japan, India & Mexico that are under water that we know has been there at least 10,000 years.

If we can't recognise the evidence in plain rock of an advanced society, (& most probably one made by humans) what chance do we have of recognising signs of ones that may have an entirely different basis for civilisation than we have?

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