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With the Chapultepec aqueduct, also named the great aqueduct, the Aztecs built a novel uninterruptible water supply for providing fresh water to Tenochtitlan, their fast growing jewel of a capital city. A section of the aqueduct is still around today:

It's fun to think about how even 600 years ago how it was built with high availability in mind. We find engineers being engineers, no matter the age: