Tunnel of Eupalinos

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by GrigorisKoulouriotis

/ CC BY-SA 4.0

The Tunnel of Eupalinos, located in Pythagoreion on the Greek island of Samos, is an ancient aqueduct constructed in the 6th century BCE. Engineered by Eupalinos of Megara, this marvel of ancient engineering stretches over a kilometer through Mount Kastro. Its primary function was to provide a reliable water supply to the ancient city of Samos. Remarkably, the tunnel was excavated from both ends simultaneously and met in the middle with astonishing precision, a testament to the advanced techniques and understanding of geometry of the time.

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