The Hagia Sophia in Istanbul served as a Christian cathedral for nearly 1,000 years before becoming a mosque and then a museum.
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The Dead Sea lies at one of the lowest elevations on land.
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Glacial periods caused sea levels to drop significantly.
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Nan Madol is an ancient city built on artificial islets in Micronesia.
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The Maldives is the world's lowest-lying country, with an average ground level of just 1.5 meters above sea level.
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Africa is so large that the United States, China, India, and most of Europe could all fit inside it simultaneously.
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The Nile River flows northward into the Mediterranean Sea.
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