Posted 16 September 2012 - 10:33 AM
I agree with The Mule and Chasingtherabbit, our buildings (like almost everything else in this society) are not made to last long. They're made to impress, but scratch the surface and there's nothing below.
Anyway, the Great Wall wouldn't last long without maintenance too, it's news from last week that a piece of it just collapsed.
If you think carefully, it's also true that few buildings and monuments in history lasted thousands of years: of the seven original Wonders only the pyramids exist nowadays, and we're still debating about who built them, if the Egyptians, an old lost civilization, the aliens or the Smurfs.
Without maintenance, few buildings can survive: I grew up in a 400+ years old house and my girlfriend lives in a house that has round 800 years (it's been built in the XIII century), but, although they're not very domotic, they're just regular houses to live in. That's because they're cyclically restored, otherwise after some centuries they'd fall apart.
What's really changed is the construction technique and the materials used: once they used stones and bricks, today we use concrete, that tends to disgregate with time.
So, we should look at buildings or monuments made with stone, or out of it: Mount Rushmore could be a perfect candidate (I personally don't like it, but that's another story). All other buildings listed above won't last very much: Spring temple Buddha would collapse due to its concrete base (and the copper would end up eaten by rust), like would Christ the redeemer do (or probably it would "only" lose his arms). The Motherland Calls is unfortunately already leaning, due to groundwater problems, so without help it won't last even decades.