The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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One cubic mile of seawater contains about 50 pounds of gold.
79
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The average ice berg weighs 20,000,000 tons!
54