Ruins of ancient wall near Tivoli, Italy.
Walls at Vitriano near Tivoli.
DODWELL, Edward. Views and Descriptions of Cyclopian, or, Pelasgic Remains, in Greece and Italy; with Constructions of a later Period; from Drawings by the late Edward Dodwell, ESQ. F.S.A. and member of several foreign Academies: Intended as a supplement to his Classical and Topographical Tour in Greece during the years 1801, 1805, and 1806. One hundred and thirty-one Lithographic Plates, London, Adolphus Richter, MDCCCXXXIV [=1834].
Art and antiquities
The Gennadius Library - The American School of Classical Studies at Athens