Millions of dollars spent on useless , unfinished or cancelled projects . Building Teton Dam took four years ; drilling took one afternoon . ( Mental Floss ) -- 1 . $ 12 billion superconductor in Texas was never finished .
Millions of dollars spent on useless , unfinished or cancelled projects . Building Teton Dam took four years ; drilling took one afternoon . $ 12 billion superconductor in Texas was never finished .