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View video clips of Gutzon Borglum and the workers as they sculpt a national monument.
11:25
The story behind the world's largest sculpture and the shrine of democracy.
2:22
Borglum built a studio size model of Mt. Rushmore and then enlarged it to scale.
2:49
Engineers plan a pipe system to deliver clean water to Chicago from Lake Michigan.
1:12
WARNING: GRAPHIC CONTENT: Lynching was a danger African-American men faced in the South.
1:05
Engineer Theodore Judah solved the great riddle of the Pacific Railroad at Donner Pass.
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.