In mainland Greece, the inhabitants of Sparta, Argos and Corinth abandoned their cities for fortified sites in nearby high places; the fortified heights of Acrocorinth are typical of Byzantine urban sites in Greece. In Italy, populations that had clustered within reach of Roman roads began to withdraw from them, as potential avenues of intrusion, and to rebuild in typically constricted fashion round an isolated fortified promontory, or "rocca"; Cameron notes similar movement of populations in the Balkans, 'where inhabited centres contracted and regrouped around a defensible acropolis, or were abandoned in favour of such positions elsewhere."