Scholars are still striving to uncover clues to the mysteries of engineering marvel Machu Picchu—in the meantime it continues to marvel visitors the world over https://on.natgeo.com/2ZxQLKD

Scholars are still striving to uncover clues to the mysteries of engineering marvel Machu Picchu—in the meantime it continues to marvel visitors the world over https://on.natgeo.com/2ZxQLKD 

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