$14.6 Billion Later, Boston's Big Dig Wraps Up

"It may not look as dramatic as the Hoover Dam, but the revamp of traffic flows in one of America's oldest cities rivals any past US public-works project in complexity - and outpaced them all in cost... Its effects will be felt for decades and far beyond Boston: It is changing commuting habits here, may influence the prospects for any similarly large-scale efforts in the future, and has hit the pocketbook of almost every taxpayer in America."

Thanks to Chris Steins