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Tagseupalinos
1 place carries this tag, across every kind and continent it appears in.
🇬🇷 Greece · Hydraulic works
Archaic (600–500 BCE) · Ionian Greek (Samian) — engineer Eupalinos of Megara
Herodotean 1,036-m tunnel 550 BCE dug from both ends with 60 cm meet error.