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Message: <blockquote data-quote="Umbran" data-source="post: 1429225" data-attributes="member: 177">The threads linked are pretty darned good, but perhaps putting some information here would be useful...Exactly how long a thing lasts really depends upon the local weather conditions and the materials.Dry climates are much more friendly to man-made objects than damp ones.  Yearly freeze and thaw cycles are nasty to most structures.Yes, there are 400 year old wooden structures in existance.  However, I've yet to hear of one that was not attended and maintained for most or all of it's existance.  Left unattended, in a temperate clime (with rain, snow, warm summers and freezing winters, the lifespan of a wooden structure is on the order of decades, not centuries or millennia.Natural stone has a much longer lifespan than man-made concrete, in terms of weathering.  To give you an idea of roads - the interstate highway system came to be in the Eisenhower years.  Note that mere decades later it is in constant need of repairs.  Signs of the roads may be visible centuries later, but it won't be much of a road after a few decades (again, assuming temperate, climes with moderate rainfall).</blockquote>