What I can see

The excavated antiquities in Monastiraki metro station show a part of the Heridanos river, which was the main area in which private activity in antiquity developed. Two paths to the north and south show where homes and other private places, such as workshops and warehouses, began. The river was later covered over by orders of the Roman Emperor Hadrian and thus turned into a sewer. The retaining wall reveals the existence of a portico or a road.

What I can't see

Heridanos is a tributary of Ilissos river towards the west and stems from Lycabettus Hill. Herodotus, Plato and Pausanias mention it in their works. According to another scientific view, this stream may not be the Heridanos but the Kaissariani’s creek, which stems from the mountain of Hymettus. However, nothing is certain yet. According to ancient sources, the river was polluted, which was a problem in antiquity. A little further down, in Kerameikos, the Athenians used the banks of Heridanus as a cemetery, long before the construction of the gates and walls.

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