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Re:Warning signs for the year 10,000 by maxklein on Saturday February 12, 2011 @05:07PM (#2211245)
Why not just put a bunch of spikes 50 feet below the ground, with a lot of scattered stones cut into the shapes of skulls. Most people will get that, and it will avoid having a prominent above ground landmark.

Although on the other hand, if there are above ground landmarks, then knowledge about what the place signifies is less likely to vanish.

Re:Warning signs for the year 10,000 by joe_the_user on Saturday February 12, 2011 @07:19PM (#2211603)
Anything you create above ground will have to survive the equivalent of being sand-blasted for many weeks.

No sculptural details are going to survive. You can write symbols though, by mixing different colored concretes.