So, the United States is taking all of its nuclear waste out of all of its scattered nuclear waste holding sites, and burying it all in a single location somewhere in Nevada.
The problem: the waste is going to be dangerously radioactive for at least 20,000 years. Long after we're dead and gone, and America has gone the way of ancient Rome, how do we communicate to far future generations that they should not get curious and dig up the site?
This article on Salon.com goes through the thinking behind designing this facility to communicate with future generations which might speak something other than English. The site will be rife with monuments and symbols saying to would-be archeologists, basically, "DIG HERE AND DIE!"
An interesting approach. It's worked so well for the Egyptians, hasn't it?