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Street scene on Karntner Strasse, Vienna, February 1968 (Photo by Frances M. Ginter/Getty Images)

World's best and worst cities to live in

Melbourne holds the top spot as the most livable city for the third year

in a row, according a report by the Economist Intelligence Unit. The

study, based on 30 factors such as quality of health care and threat of

military conflict, ranked 140 cities.