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Rope Bridges Across Deep Canyons
The Qhapaq Ñan, or Great Inca Road, that united the Inca Empire in the Andes Mountains was a tremendous engineering achievement. The Incan road designers took advantage of many pre-existing roads and trails. They expanded this system until the vast empire, which flourished from 1438 to 1533, was linked together by a 25,000 mile network