This place is not a place of honor.
  No highly esteemed deed is commemorated here.
  Nothing valued is here.
  This place is a message and part of a system of messages.
  Pay attention to it!
  Sending this message was important to us.
  We considered ourselves to be a powerful culture.

Hard to imagine a circumstance in which such a statement is not a lie. In this case it's a real doozy; plutonium is the most valuable substance on Earth.

On the other hand, maybe such a confused people do not deserve it.