There's a lake under Antarctica that is 25 million years old called Lake Vostok.
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A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
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One cubic mile of seawater contains about 50 pounds of gold.
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The city of Houston, Texas is built on a swamp and is slowly sinking!
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
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The state of Florida is bigger than England!
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In 1850, only 8% of the people in California were women.
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