How does a project meant to cost $2.8 billion end up at nearly $15 billion? The Big Dig in Boston is a textbook case of infrastructure mismanagement, from poor planning to major safety hazards.

On the Chelsea side of the bridge, residents are skeptical about the potential project. "You've got something that's proven, put the money into it, you're going to start another big dig project?" ...

Though the Big Dig was the largest exploration of ice age ... a stone scraper which scientists working on the Tule Springs project estimate is 11,000 to 12,000 years old. The scraper was hailed ...