The Eridanos River arched vaulted channel beside the Sacred Gate. Kerameikos. Athens. Greece. The vaulted channel allowed the Eridanos River to flow through it (the gate) undisturbed. The river bed of the part channel was given a paved surface. The Sacred Gate was built in the 5th century BC at the same time as the Themistocles wall and marks the beginning of the Sacred Way to Eleusis. Serving as a burial ground as long ago as the 12th century BC, Kerameikos located in the ancient neighbourhood of potters contains part of the ancient city walls and the Dipylon, the main gate of Ancient Athens at a junction of the Sacred Way and Panathenaic Way. It served as a burial ground for the richest and most distinguished citizens of the city.