Now the spotlight shines on the growth, glamour and grief of New York during America's giddy postwar "Gilded Age." Exploring the incomparable wealth of the robber barons and the unabashed corruption of political leaders, such as Tammany Hall boss William M. Tweed, the episode examines the era when the expansion of wealth and poverty -- and the schism between them -- built to a crescendo. The program ends as the city itself dramatically expands its boundaries, annexing Brooklyn, Queens, the Bronx and Staten Island into a single massive metropolis -- Greater New York.