Always wondered why the price tag was so high for some steel beams, some welding, some digging and some foundation work.
At 46 megabucks a mile, that comes out to $8712 a foot. And from the views of the Wall I've seen, about six inches of that foot is open air.
Hint: Land mines + Signs (in English, of course) cost a hell of a lot less, and then we can feed the vultures for free.