Tunnel of Eupalinos Photos

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The Tunnel of Eupalinos or Eupalinian aqueduct is a tunnel of 1,036 m (3,399 ft) length in Samos, Greece, built in the 6th century BC to serve as an aqueduct. The tunnel is the second known tunnel in history which was excavated from both ends , and the first with a geometry-based approach in doing so. Today it is a popular tourist attraction.
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Eupalinian Aqueduct

End Sign Eupalinian Aqueduct