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Modern Marvels: 1x1
Grand Coulee Dam
The world’s largest concrete dam–and the largest concrete structure in the world–lies on the Columbia River in the State of Washington. B uilt in 1931, it is also one of the largest hydroelectric power plants in the world.
1 - 1Grand Coulee Dam Dec. 10, 1993
1 - 2The Empire State Building Jan. 21, 1994
1 - 3The Panama Canal Mar. 04, 1994
1 - 5Transatlantic Cable Mar. 27, 1994
1 - 6Mt. Rushmore. Mar. 13, 1994