What impact did serpents of various sorts have on the world’s landscapes in Graeco-Roman eyes? This chapter considers several aspects of this question, including the physical traces that the great dragons of myth, defeated by a god or a hero in the remote past, had left behind them; the land of Libya, supposedly imbued with fantastical and terrible serpents still in present time; and the (real) landscapes that the ancients populated for themselves with benign and healing serpents.