''This is not a place of honor.''

Warning future generations about radioactive waste burial sites. Or at least trying to.
''Sandia National Laboratories charged a panel of outside experts with the task to design a 10,000-year marking system for the WIPP (Waste Isolation Pilot Plant) site, and estimate the efficacy of the system against various types of intrusion. The goal of the marking system is to deter inadvertent human interference with the site.''
Some of the people involved in this Sisyphean task did not believe that it was even possible for it to be accomplished-

''If the WIPP is ever operational, the site may pose a greater hazard than is officially acknowledged. Yet the problems involved in marking the site to deter inadvertent intrusion for the next 10,000 years are enormous. Even if knowledge exists that would allow translation of the message on the markers, there might be little motivation to solicit such knowledge. Pictorial messages, however, are unreliable and may even convey the opposite of what is intended.''
Maybe if they had hired Robert Smithson...

Sandia National Laboratories report (SAND92-1382 / UC-721)

http://www.wipp.energy.gov/picsprog/articles/wipp%20exhibit%20message%20to%2012,000%20a_d.htm