How old do you think Machu Picchu is?

Evidence has been found that it may be older than originally believed, but researchers think Machu Picchu might be even older than that.

Until now, historians had to rely on the Spanish conquistadors to guess at the age of the Incan citadel, high in the Andes Mountains of Peru. Researchers now have evidence that human habitation began in Machu Picchu at least decades earlier.

“People were thinking that it dated back to 1450,” Richard Burger, a professor of anthropology at Yale University, tells Morning Edition.

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