Reporting from Khan Bani Saad, Iraq — The shell of a prison that will never be used rises from the desert on the edge of this dusty town north of Baghdad, a hulking monument to the wasted promise of America’s massive, $53-billion reconstruction effort in Iraq. Construction began in May 2004 at a time when U.S. money was pouring into the country. It quickly ran into huge cost overruns. Violence erupted in the area, and a manager was shot dead in his office. The Iraqi government said it didn’t want or need the prison. In 2007 the project was abandoned, but only after $40 million of U.S. taxpayer money had been spent. BY LIZ SLY, LOS ANGELES TIMES AUG. 29, 2010 12 AM PT