what do you think how long it would take for sign of human civilization to disappear?

I'm not talking about something morbid like a virus killing us all lets just say an area gets deserted for whatever reason...how long would it take for roads to be overgrown?for houses to crumble?

Biff2015-12-10T12:10:57Z

decades - i saw a show on TV called After Man or something like that and it showed what the world would look like if all humans disappeared at one time - it showed it at different yrs after humans 5, 10, 50, 100, 500, etc - it was very interesting

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