Towering over the Black Hills of South Dakota, Mount Rushmore is a beloved American masterpiece that was built over the course of 15 years, with 350 men pouring their sweat into the grand vision of talented young sculptor Gutzon Borglum. Using drills and explosives, they carefully chiseled Washington, Jefferson, Lincoln, and Roosevelt into the massive granite cliff. MODERN MARVELS® explores the controversial history of this unorthodox monument, including the remarkable design specifications, the tragedies and setbacks that marred its construction, and the awe it inspires to this day.
The task seemed unsurmountable: build the world’s largest dam in the middle of the desert, then tame the river that carved the Grand Canyon, and do it all in seven years! When the Hoover Dam was completed at last in 1935. It became the largest dam in the world. Hoover Dam reveals how this engineering wonder of the world was conceived and built.