Gates and towers ar the fortification walls of Eleutherae fortress, also known as Gyftokastro.
Tower and gates at Eleutherai.
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