The great wall of China is 1,400 miles long!
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The World Trade Center towers used to have two zip codes, 10047-10048, one for each building.
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To take an oath, ancient Romans put a hand on their testicles
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Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
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During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
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In 1537, England's King Henry VII officially declared February 14th the holiday of St. Valentine's Day.
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Romans used a plant called Silphium as contraception. They had so much sex that they drove it into extinction.
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In 1963, the US Military created an artificial ring around Earth, similar to that of the planet Saturn. The ring was made of copper needles and was used for worldwide communications in the case that the Soviets disabled all other methods of communication.
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