1970
13,000 miles
The Great Wall of China opened to the world for tourism.
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1871
Journalist and explorer Henry Stanley found the missing David Livingstone in Central Africa and made his famous comment, "Dr. Livingstone, I presume?"
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1928
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1951
The first long distance telephone call without operator assistance took place.
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1969
Sesame Street premiered on PBS TV.
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1982
The Vietnam Veterans Memorial opened in Washington, DC.
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