The Serpentine column from Apollo's sanctuary at Delphi at the Byzantine Hippodrome of Istanbul (At Meydan), today Sultan Ahmed Square. The porphyrite column at the ancient Forum of Constantine (today Cemberlitas Square), in Istanbul. The column of Marcian, in Istanbul
The Serpentine Pillar. The Porphyry Pillar. The pillar of the Emperor Marcian.
THOMPSON, Charles. The travels of the late Charles Thompson, Esq. Containing his observations on France, Italy, Turkey in Europe, the Holy Land, Arabia, Egypt, and many other parts of the world : giving a particular and faithful account of what is most remarkable in the manners, religion, polity, antiquities, and natural history of those countries : with a curious description of Jerusalem as it now appears, and most other places mention'd in the Holy Scriptures / publish'd from the author's original manuscript, interspers'd with the remarks of several other modern travellers, and illustrated with historical, geographical, and miscellaneous notes by the editor, vol. II, Reading, C. Micklewright, 1752.
Art and antiquities
The Gennadius Library - The American School of Classical Studies at Athens