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The 'small kingdoms' in the land castle in China
If you travel to Fujian, China, you should not ignore fortified castles like these impregnable fortresses.
Long Earth
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Articles about Long Earth
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Scientific works
Underground work in the desert is as long as the Earth's distance to the Moon
The total length of thousands of underground waterways in the Iranian desert is equivalent to the distance of the Earth to the Moon (384,400km).