Site: Gadara Sub site: The Ancient Worldâ€™s Longest Underground Aqueduct Period: Roman
Description: This massive water tunnel begins in an ancient swamp in Syria, which has long since dried out, and extends for 64 kilometers on the surface before it disappears into three tunnels, with lengths of 1, 11 and 94 kilometers. The longest previously known underground water channel of the antique world -- in Bologna -- is only 19 kilometers long. "Amazing" is the word that the researcher uses to describe the achievement of the construction crews, who were most likely legionnaires. The soldiers chiseled over 600,000 cubic meters of stone from the ground -- or the equivalent of one-quarter of the Great Pyramid of Cheops. This colossal waterworks project supplied the great cities of the "Decapolis" -- a league originally consisting of 10 ancient communities -- with spring water. The aqueduct ended in Gadara, a city with a population of approximately 50,000. According to the Bible, this is where Jesus exorcized demons and chased them into a herd of pigs.