The enclosed streambed of Heridanos since 2th century A.D. was discovered in 1992 during the metro works at Monastiraki square at a depth of 5.72 till 6.44 m, length of 12.94 m and width of 2.80 m. The plinth arched construction that roofs the streambed, shows three construction phases, two in the roman era and one in the ancient Christian. The excavations indicated an ancient road exactly upwards the stream bed while downwards there were houses, storage spaces and laboratories.

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