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The Liberty Bell is mostly copper

The Liberty Bell is bronze, about 70 percent copper and 25 percent tin, and weighed 2,080 pounds when it was ordered.

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It began as the bell of the Pennsylvania State House. Only in the 1830s did it start to take on meaning as a symbol of liberty.

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The United States bought Alaska for 2 cents an acre

The United States paid Russia $7.2 million for Alaska, less than 2 cents an acre.

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Stonehenge was begun about 5,000 years ago

The first monument at Stonehenge was built about 5,000 years ago, and the stone circle was erected about 2500 BC.

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The Pony Express lasted only 18 months

The Pony Express operated for just 18 months, between April 1860 and October 1861.

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