26. The Manhattan Project.

At 5:30 a.m., July 16, 1945, scientists and dignitaries awaited the detonation of the first atomic bomb in a desolate area of the New Mexico desert aptly known as "Jornada del Muerto" (Journey of Death). Dubbed the Manhattan Project, the top-secret undertaking was tackled with unprecedented speed and expense–almost $30-billion in today's money. Los Alamos scientists and engineers relate their trials, triumphs, and dark doubts about building the ultimate weapon of war in the interest of peace.