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Tagged “hydraulic-engineering”

• HIGH WONDER

  The Pont du Gard

  How did Roman surveyors, working with a water-level trough and a sighting frame, lay out a 50-kilometre water channel that falls only about a dozen metres end to end — and then carry it across a river gorge on three tiers of dry-laid stone that drop just 2.5 centimetres from one bank to the other?

  mid-1st century CE (long attributed instead to c. 19 BCE) · Vers-Pont-du-Gard, Gard, Occitanie, FranceAdded September 2026
• HIGH WONDER

  Sigiriya

  In under two decades, a usurper king turned a sheer 180-metre granite monolith into a fortified palace with rock-cut summit cisterns and gravity-fed garden fountains that still spring to life in the monsoon today — how was a royal water-supply system this precise engineered, and hauled into place, at that height and on that timeline?

  c. 477-495 CE (reign of King Kashyapa I) · Sigiriya, Central Province, Sri LankaAdded July 2026