The old Pelasgic ruins of Greece, Asia Minor, and Italy, such as the Gallery of Tiryns, the Gate of Lyons, the Treasury of Athens, and the Tombs of Phoroneus (3 syl.) and Danaos. They are said to have been the work of the Cyclops. They are huge blocks fitted together without mortar, with marvellous nicety.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894