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2:33
During the dam's construction, the job of the high scaler was by far the most dangerous.
0:44
Workers moved the Colorado River from the bed it had known for 12 million years.
1:31
The first effort to build a subway dates back to the 1850s with Alfred Ely Beach.
1:23
At least 7,700 men would be needed to build the Interborough Rapid Transit, or IRT.
0:20
In June, 1902, subcontractor, Ira Shaler, suffered a fatal accident in the east tunnel.
2:39
Footage from the 1927 flood, including shots of workers and aerial views of the flooding.
5:55
An interview with David Grubin, producer of Abraham and Mary Lincoln: A House Divided.
7:20
Historian Joseph Glatthaar discusses African American regiments in the Civil War.
2:59
On June 6, 1933, workers poured the first bucket of concrete that would build the dam.