υπό κατασκευή

At the behest of the Hellenic Ministry of Infrastructure and Transport, we learn via Boing Boing, architectural photographer Pygmalion Karatzas has documented the expansion of the metro systems of Athens and Thessaloniki. Dating back to 1869 as a conventional steam railway before electrification at the turn of the century, Μετρό Αθήνας (see also) has been the only subway in Greece, now serving the Piraeus, until the expected completion of the Thessalonki network in 2023. Any sort of construction—never mind mega-projects like these, present particular challenges for ancient and venerable places (relatedly) and may yield more discoveries yet. See a whole gallery of Karatzas’ works at the links up top.