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1:19
Summit Tunnel is 1,659 feet long and through some of the hardest rock in North America.
0:28
The Central Pacific's best hope was a dangerous gamble: liquid nitroglycerin.
0:43
Workers dug tunnels through mountains in Utah and laid track in the Wyoming desert.
2:41
View video clips of Gutzon Borglum and the workers as they sculpt a national monument.
21:27
Conservation Specialist Linda Edquist demonstrates preservation techniques.
2:22
Borglum built a studio size model of Mt. Rushmore and then enlarged it to scale.
9:37
John D. Rockefeller was the world's first billionaire and the most hated man in America.
2:46
Historian Elizabeth Young discusses women and literature before the Civil War.