American Society of Civil Engineers — Qhapaq Nan

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Technology Engineering

Without Cooling Pipes, Hoover Dam Would Still Be Curing

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Technology Engineering

The Brooklyn Bridge opens in New York City

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Technology Engineering

America's first roller coaster opened at Coney Island

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Technology Energy

The world's first hydroelectric central station switched on

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History Empires & Civilizations

The Inca ran a 24,000-mile road empire without writing or the wheel

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