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to have entire view of any attack from any invaders. The origins of the fortress is generally attributed to the period of Inca Pachacuteq. The massive blocks, the largest being 8.5m high and weighing nearly 300 tons, are fitted together with absolute perfection.
The foundations are made of quarry limestone brought from over 15km away. With only natural fiber ropes, stone hammers and bronze chisels it must have been an enormous task. The chronicler Cieza de Leon, writing in the 1550's, thought that some 20,000 men had been involved in its construction: 4000 men cutting blocks from the quarries; 6000 dragging them on rollers to the site; and another 10,000 working on finishing and fitting them into position. According to legend, some 3000 lives were lost when one huge stone that was being dragged uphill broke free.
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