Documentary .

On August 15, 1914, the Panama Canal opened, connecting the world’s two largest oceans and signaling America’s emergence as a global superpower. American ingenuity and innovation had succeeded, but the U.S. paid a price for victory: more than a decade of ceaseless, grinding toil, an outlay of more than $350 million — the largest single federal expenditure in history to that time — and the loss of more than 5,000 lives. Along the way, Central America witnessed the brazen overthrow of a sovereign government, a revolutionary public health campaign, the backbreaking removal of hundreds of millions of tons of earth and construction on an unprecedented scale. The story of the canal features a cast of colorful characters ranging from an indomitable president to visionary engineers to tens of thousands of workers from around the world, rigidly segregated by race. Using an extraordinary archive of photographs and footage, some remarkable interviews with canal workers and firsthand accounts of life in the canal zone, director Stephen Ives and producer Amanda Pollak unravel the remarkable story of one of the world’s most significant technological achievements.

Watch Tuesday, April 3, 2012 at 8:30pm.

Watch The Panama Canal on PBS. See more from American Experience.

Grand Coulee was more than a dam — it was a proclamation. In the wake of the Great Depression, America turned from private enterprise to public works — not simply to provide jobs, but to restore faith. The ultimate expression of Franklin Roosevelt’s New Grand Coulee was more than a dam — it was a proclamation. In the wake of the Great Depression, America turned from private enterprise to public works — not simply to provide jobs, but to restore faith. The ultimate expression of Franklin Roosevelt’s New Deal, Grand Coulee played a central role in transforming the Northwest; it was the largest hydroelectric power producing facility in the world when it was completed in March 1941. After WWII, a vast irrigation project made possible by the dam helped turn the barren deserts of central Washington into rich farmland. But the dam prevented access to one of the greatest salmon rivers in the world. Deprived of the salmon — their most important resource — the native people who lived along the Columbia witnessed a profound cultural decline. Featuring the men and women who lived and worked at Grand Coulee and the native people whose lives were changed, as well as historians and engineers, this film explores how the tension between technological achievement and environmental impact hangs over the project’s legacy.

Watch Tuesday, April 2, 2012 at 7pm.

Watch Grand Coulee Dam Preview on PBS. See more from American Experience.