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2 places to sift through. Narrow by kind, country, period or how firmly each one is established — contested and pseudoarchaeological claims are labelled here, never hidden.
🇮🇷 Iran · Hydraulic works
Ilkhanid to Qajar (Mongol to Qajar) · Mongol–Persian Ilkhanid hydraulic engineers (maybe Ghiyath al-Din?)
1350 Mongol thin arch 64 m with 1.05 m crest over 5-m gorge, world's tallest for 540 years (1350–1902).
🇮🇷 Iran · Hydraulic works
Ilkhanid Mongol (1300) to Safavid · Mongol–Persian hydraulic (Rashid al-Din's Jami' al-Tawarikh?), Qom Shi'a
1300 Mongol 26-m arch radius 35 m, oldest surviving arch dam (first Mongol), 294 yr before Tibi Europe.