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In this Aug. 3, 2018 file photo, tourists walk at the Mayan ruins of Chichen Itza in Mexico's Yucatan Peninsula. In 1967, construction workers at a new airport near the ancient Maya city made a startling discovery. While excavating, they unearthed human remains in the proposed runway area, halting the project. (AP Photo/Eduardo Verdugo) **FILE**

In this Aug. 3, 2018 file photo, tourists walk at the Mayan ruins of Chichen Itza in Mexico's Yucatan Peninsula. In 1967, construction workers at a new airport near the ancient Maya city made a startling discovery. While excavating, they unearthed human remains in the proposed runway area, halting the project. (AP Photo/Eduardo Verdugo) **FILE**

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