Check out this incredible article on io9
Best line in this article: "The upheavals of war and natural disasters over 2,000 years have probably caused us to lose many more works and wonders that will never be found."
Every time I hear about things like the library of Alexandria being burnt down, or the Parthenon being blown up because the Turks lobbed a cannon ball in there, or the Taliban destroying ancient Buddhist artwork, I cry on the inside. Imagine where we could be now if it was not for all of these setbacks.