Image: 2008.18.0093: Map of Attica (dated 1923) showing the sources of poros limestone in Piraeus and the locations of marble quarries on Mount Penteli: (a) the Agora; (b) the city of Piraeus; (c) the area of Piraeus called Drapetsona, where the second poros quarry was located; (d) the peninsula of Piraeus named Akte, where the first poros quarry was opened; (e) the village of Kifissia (now a suburb of Athens), through which one must pass to get to the marble quarries on the north and south slopes of Mount Penteli; (f ) the village of Dionyso, where nearby the Dionyso-Pentelikon Co. had its marble quarry; (g) Mount Penteli; (h) the area of Mount Penteli known as Kokinarras, where the Parthenon Marble Co. had its quarry; (i) the city of Athens; (j) Mount Hymettos. The distance from the Agora to Piraeus is ca. 8 kilometers, and to the marble quarries on Mount Penteli ca. 20 kilometers.