Landmarks

What is this 13,000+ mile long structure?

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Where in Massachusetts is Harvard University?
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What is this 13,000+ mile long structure?
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Where can you find Everglades National Park?
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You can find Great Smoky Mountains National Park at which location?
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Located in Honduras, Copan was once one of the most important cities of what great ancient culture?
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What 30-m tall statue is located at the peak of the 700-m Corcovado mountain in Rio de Janeiro, Brazil?
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The Great Wall of China was built for what reason?
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In what country is the World Heritage site, Semmering Railway?
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