Contrary to popular belief, the first ironclad warships were built by Korea in the 16th century.
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The U.S. motto, 'In God We Trust', was not adopted as the national slogan until 1956.
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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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February 1865 is the only month in recorded history to not have a full moon.
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Al Capone's armored limousine, after being seized by the feds, was later used to protect Franklin Delano Roosevelt (FDR), 32nd President of the US, after the attack on Pearl Harbor.
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No one knows who designed the first American Flag.
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