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0:59
Joseph Strauss hired Irving Morrow to design an architectural treatment for the bridge.
2:38
The towers of the Golden Gate Bridge rise 745 feet into the air.
2:54
The most impressive innovation was the technique used to construct the bridge's cables.
1:38
In the 19th century, the grain elevator was a revolutionary technology.
1:40
To solve city's water supply & sewage disposal problems, the Chicago River was reversed.
1:12
WARNING: GRAPHIC CONTENT: Lynching was a danger African-American men faced in the South.
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The opening minutes of a 1960 film by a pro-segregation commission in Mississippi.
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Photos of Till were published in newspapers and magazines.
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In the 20th century, hundreds of thousands of African-Americans moved North.
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The streets and buildings of Chicago had to be raised to accommodate a new sewage system.
2:49
Engineers plan a pipe system to deliver clean water to Chicago from Lake Michigan.
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Improvements in elevators and the creation of structural steel made skyscrapers possible.
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