1. A building or military installation that is never intended to be used, but which must be constructed anyway for political reasons.
2. A public space that planners know will never be occupied or properly used. It gets built anyway to satisfy a planning commission or zoning board.
3. The act of constructing something useless and pointless because it is demanded by an overall "plan."
"Did you hear about those Pre-Abandoned schools in Iraq? They built them out in the desert without any electricity or air conditioning. No one will ever use them, but at least they look good on paper."