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To tackle this, Burger led a team of US investigators in carrying out accelerator mass spectrometry (AMS) dating of human remains from Machu Picchu.
They examined the remains of 26 individuals and the results, published in the peer-reviewed journal Antiquity, strongly suggested continuous use of the site from 1420 at the latest – and probably earlier – until 1530. The latter date would roughly coincide with the start of the Spanish conquest of the Inca empire.
“This is the first study based on scientific evidence to provide an estimate for the founding of Machu Picchu and the length of its occupation,” said Burger, adding that earlier such attempts did not produce sufficiently reliable results. ....

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