The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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It's still possible to see the division between East and West Germany due to different light bulbs.
5
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25
Mexico City is built on top of an underground resevoir!
47
The average ice berg weighs 20,000,000 tons!
54
The Caspian Sea is also classed as the world's largest lake.
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