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Lasers reveal 15th-century fortified Zapotec city in Mexico

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Lasers shot from an aircraft have revealed the remains of a 600-year-old Zapotec city in southern Mexico .

The 15th-century city known as Guiengola was founded by the Zapotsecs in the 14th and 15th centuries .

The city's full extent was not known until scientists used lidar (light detection and ranging) to map it.