How the Romans made entire mountains VANISH!

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We think that only we in our modern times can have a significant impact on large landscapes with huge mining operations, but the romans prove us wrong. In the spanish region of Leon lies an unusual landscape called "Las Medulas". What is so special about this landscape, is that it is man made. The romans had mined gold here on such a vast scale, as to make entire mountains disappear, and what is left now, has thus this strange shape. For around 250 years they washed out huge quantities of earth from these mountains using hydraulic power. It is estimated that forty million cubic meters of earth were removed from the central zone of the mountain range, alone. What we can see on this picture is only a small part of what once were the original Medulla mountains. A mountain containing 200 billion cubic meters of material disappeared completely. This resulted in at least 1 million kilograms of gold that was mined here in its 250 years of activity. It is remarkable that an ancient civilization already had such a huge impact on landscapes, something that had been thought to be a purely modern day phenomenon.