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Tagged “engineering”

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  Bent Pyramid of Sneferu

  Why does this pyramid change its angle partway up — steep near the base, then suddenly shallower — and what does that visible 'correction,' frozen in stone, tell us about how the Egyptians learned to build a true pyramid?

  c. 2600 BCE (Fourth Dynasty, reign of Sneferu) · Dahshur, Giza Governorate, EgyptAdded July 2026
• HIGH WONDER

  The Pantheon

  How did Roman builders raise a 43-metre unreinforced concrete dome that nobody matched for the next thirteen centuries — and what held it up while the concrete set?

  c. 113–128 CE (begun under Trajan or Hadrian, completed under Hadrian) · Piazza della Rotonda, Rome, Lazio, ItalyAdded September 2026
• MUST READ

  Taq Kasra, the Arch of Ctesiphon

  How did Sasanian builders raise a 25-metre unreinforced brick vault to a height of 37 metres with no timber centring holding it up — and how did they arrive at a curve that European engineers only described mathematically eleven centuries later?

  3rd–6th century CE (Sasanian; most often placed c. 540 CE under Khosrow I) · Ctesiphon, Salman Pak, Baghdad Governorate, IraqAdded September 2026