Rheitoi

On a low hill dividing the eastern shore of Eleusis Bay from the ancient Rheitoi lakes, only one of which survives as the polluted Lake Koumoundouros, stand the faintest traces of a medieval tower. Its foundations measure 8.80 by 12.55 metres, though little more than the outline remains; Langdon, who catalogued the mortared towers of Greece, recorded a maximum surviving height of 1.20 metres, and erosion has since reduced even that. The walls, built of rubble and ceramic slips bound with mortar, show clear signs of burning, and excavation found the interior almost entirely filled with ash. Scraps of late Roman or early Byzantine pottery suggest an early medieval date, though the precise origin of the structure is unknown. Today only these few, charred remnants mark the summit of the archaeological site, a modest ruin whose story is told mostly through its destruction.