Changing the course of rivers has changed the course of history. Award-winning author/illustrator and storyteller, David Macaulay goes to extremes to bring you an unprecedented look at the power of dams. From the banks of the Nile to the top of the Hoover Dam, you'll meet the builders, relive the disasters, and discover the little-known triumphs and tragedies behind the greatest dams ever built.

Originally aired on Public Television. Special features: printable materials for educators and parents ; access to the Building big Web site.