... that cities could trade with each other and also with foreign nations. Trade was one of the main ways of bringing wealth into the cities, especially if they are at a junction on a trade route. Some of the world's most famous ancient cities, like Damascus in Syria, and Xian in China, lay on the Silk Road that crossed Asia, connecting China with the Mediterranean. The initial development of a city and the time at which it started to develop has a large impact on the internal structure of a city. Many old cities in Europe still retain their old core and as the city has been required to change to suit a different purpose. This means that cities such as London and Seville have large old quarters, and this affects the way in which the city is laid out. The main period during which the developed world cities developed was whilst ...

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