I personally wonder when the anti-zombie uprising will begin. The common folk can't be too happy that the only livable high-rise real estate is populated by a bunch of heavily armed, resurrection-addicts... It probably smells down there too.
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What if its really a prison? And not a city? Walls dont just keep people out....they keep people in too. Prisons also have towers on the perimeter.... Yeah this is a long shot but still.