The aqueduct of Eupalinos at Samos Island, Greece

The tunnel of Eupalinos in Samos Island is a masterpiece of ancient hydraulic engineering, admired, amongst others, by Herodotus. Built in the 6th c. BC the aqueduct was built to improve the water capacity of the city and to ensure this supply, even in a state of siege. That is why it had to be underground.  Scientists engaged in the construction of large tunnels, are still amazed by the ingenious design and construction of the aqueduct.

It has been designated as an UNESCO World Heritage Site, along with Pythagoreion since 1992 and is today a widely known and visited archaeological site in Samos. 

Read the full case study: http://www.hydriaproject.info/en/greece-samos-eypalineion/importance20