The stone spheres of Costa Rica were carved to near-perfect roundness around 600 AD.
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The Eiffel Tower was once the tallest man-made structure on Earth.
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Ancient volcanic eruptions shaped prehistoric environments.
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The CN Tower in Toronto was once the tallest free-standing structure.
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New Zealand was the first country to give women the right to vote, in 1893.
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The Eiffel Tower can grow over six inches taller in summer.
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The Great Wall of China is not visible from space with the naked eye — this is a common myth.
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Angel Falls in Venezuela is the world's highest uninterrupted waterfall at 979 meters.
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The Sahara Desert receives less rainfall than most regions.
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