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Message: <blockquote data-quote="Eric Tolle" data-source="post: 4349682" data-attributes="member: 53859">Actually, due to the different construction techniques we use now, very few, if any of our structures will be standing for any appreciable length of time.  Without constant maintenence, buildings will collapse within decades, bringging other buildings down.  After a few centuries, the only thing to indicate there was a major city to the casual observer would be a profusion of non-native plants and animals.Climate will make a large difference of course- the ruins and rubble of desert cities like Las Vegas will be visible for much longer than temperate or coastal cities.  But in the main, the major traces of mankind's presence would be lines of differing vegetation following major roadways and in cities.Some references:<a href="http://www.newscientist.com/article/mg15120394.200;jsessionid=HJIJJMIGFAOL" target="_blank">Post-human London</a><a href="http://forum.skyscraperpage.com/showpost.php?p=3230458&postcount=42" target="_blank">Chicago...Without Us</a>It's arguable that the pyramids and some of the other Egyption structures would still be standing, though even there the elements will have polished it down quite a bit.What will really survive will be protected areas, like caverns and sunken areas, and the equivalent of our middens: landfills will be recognizable as artificial for hundreds of thousands of years.  Likewise, even after they are filled in, mines and artificial caverns will be recognizable as artificial from the inclusions of foreign material in the rock layers.And oh yes, there's also vacuum.  the luner modules will probably outlast anything on Earth.</blockquote>

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