Gyaros Island, Greece.
On the Makrónisos internment camp, see Yannis Hamilakis, The Nation and its Ruins, Oxford, OUP 2008, or (same author) The Other ‘Parthenon’: Antiquity and National Memory at Makrónisos, Journal of Modern Greek Studies—Vol. 20, No. 2, Oct. 2002, pp. 307–338.