There are still man-made structures from the stone age visible today and considering the longevity of modern structures you mention (not to mention the amount and size, a city like London will be a lot more difficult to obscure than a small iron age settlement), it will take far longer if the human population just died. It'd have to be worldwide catastrophic event (volcanic eruptions everywhere, a meteor the size of the moon smashing into Earth etc.) to obscure everything.
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timeasmymeasure
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Date: 2006-01-11 10:03 am (UTC)It'd have to be worldwide catastrophic event (volcanic eruptions everywhere, a meteor the size of the moon smashing into Earth etc.) to obscure everything.