Machu Picchu is Several Decades Older Than Previously Thought

New Discovery Indicates Machu Picchu Could Be Decades Older Than We Realized

Accelerator mass spectrometry — an advanced form of radiocarbon dating — reveals that Machu Picchu was in use from about A.D. 1420 to A.D. 1530 making the site at least 20 years older than the accepted historical record suggests.

Machu Picchu was built decades earlier than thought