You may want to look at http://www.longnow.org http://www.longnow.org and http://en.wikipedia.org/wiki/Long_Now_Foundation http://en.wikipedia.org/wiki/Long_Now

You may want to look at http://www.longnow.org http://www.longnow.org and http://en.wikipedia.org/wiki/Long_Now_Foundation http://en.wikipedia.org/wiki/Long_Now_Foundation. One of their projects (the brainchild of Danny Hillis) is to build a clock that will run for 10,000+ years.