Silk Road in Western Han Dynasty (206 BC–24 AD) From 139 BC to 129 BC, Zhang Qian set out on his journey to the Western Regions twice, pioneering the world-famous route.
A megalith is a large pre historic stone that has been used to build a structure or monument.
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Before steam engines most factories were powered by wind or water or horse!!
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Songhai empire, also spelled Songhay, great trading state of West Africa (flourished 15th–16th century), centred on the middle reaches of the Niger River in what is now central Mali and eventually extending west to the Atlantic coast and east into Niger and Nigeria.
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