Did you know that the Hoover Dam supplies electricity to more than 20 million people? Get all the facts on this marvel of engineering.

FACT CHECK: We strive for accuracy and fairness. But if you see something that doesn't look right, contact us!

RELATED CONTENT

On September 30, 1935, U.S. Secretary of the Interior Harold L. Ickes formally dedicates the Hoover Dam during a ceremony attended by President Franklin D. Roosevelt. The dam was built by thousands of workers in one of America's most inhospitable environments.

The awe-inspiring Hoover Dam was built in the 1930s from enough concrete to create a two-lane highway from Los Angeles to Boston. How long did America's largest, man-made reservoir take to complete?

See how Henry Kaiser's love for a young lady spurred him to build the Hoover Dam and the great military war ships.

From Ireland's national symbol to its average beer consumption, get the facts on the Emerald Isle.

Known as the “Flying Fortress,” the B-17 was the backbone of the United States’ aerial forces during World War II. Get all the facts and figures.

The UH-1 "Huey" helicopter became a symbol of U.S. combat forces in Vietnam.