For nearly a century, archaeologists believed that two huge, linear structures near Egypt’s Red Pyramid were ramps to move stones. They might have been wrong.

A new analysis of the pyramid, located at the Dashur necropolis in modern-day Cairo, suggests that the “ramps” were actually large dams. If true, this means that ancient Egypt’s architects and construction workers used a hydraulic system to supply water to the construction site nearly 5,000 years ago, according to an early-access version of the study provided by npj Heritage Science. Contextually, this interpretation is consistent with how King Snefru’s reign, during which the Red…

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