Some of the most famous engineering projects are the focus of this series of four programs from PBS. The first looks at the flood prevention systems implemented for the Mississippi River and the Hoover Dam used to harness water resources from the Colorado River in the early 1900s. The development of the US national electric system is discussed in the second. The last two consider the bridges of New York City and the Big Dig in Boston. The online components include synopses of the projects, video clips, transcripts of interviews, and an online quiz. [CL]