The Tunnel of Eupalinos or Eupalinian aqueduct (Modern Greek: Efpalinio orygma, Ευπαλίνειο όρυγμα) 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 (Ancient Greek: αμφίστομον, amphistomon, "having two openings"), and the first with a geometry-based approach in doing so.
Eupalinos tunnel strarting point.
Eupalinos tunel! The greatest engineering project of the ancient word.
NOT recommended to claustrophobic people!!!
The tunel might be not all the way open.
There will be a staff for anything you would need.
Kind of trail: