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The Byzantine Empire

The Byzantine Empire is the only empire west of China that survived from ancient times…

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The Umayyad Caliphate

The Umayyad Caliphate extended through most of the Middle East, encompassing 5.8 million square miles….

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The First Persian Empire

The First Persian Empire included 49.4 million people at its height, which was approximately 44%…

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Kelimutu, Indonesia

Episode #10 of the course “Natural Wonders of the World” On central Flores island in…

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Socotra Island, Yemen

Episode #9 of the course “Natural Wonders of the World” Off the coast of Yemen…

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New York: the world’s largest city in 1925 AD

The 1920s were definitely a booming time for the United States; in fact, the decade…

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The Richat Structure, Mauritania

Episode #8 of the course “Natural Wonders of the World” In the bare sands of…

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Waitomo Caves, New Zealand

Episode #7 of the course “Natural Wonders of the World” The Waitomo Caves on the…

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Danakil Desert, Ethiopia

Episode #6 of the course “Natural Wonders of the World” Commonly reaching temperatures of over…

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London: the world’s largest city in 1825 AD

European industrial production was growing quickly in the early and mid-1800s. It drew rural citizens…