We like to think we are permanent...a long-standing fixture of the environment. If we came back 500 years from now, we'd like to think that our cities will be as glorious as ever. But history has told us that that's not always the case, and in many instances, civilizations are abandoned without a trace. Take a look at the top 10 civilizations that have disappeared from memory, leaving only signs of their once-strong culture and questions of their demise...
http://io9.com/5928085/10-civilizations-that-disappeared-under-mysterious-circumstances
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