Suburbanization means the process of relocating people from the city center to the surrounding towns. This is a process that appears in developed countries. The beginnings of suburbanisation occur in the nineteenth century, mainly in the United States. The development of suburbanization has fueled the development of transport. There were steam forces and steam trains that had great significance for the development of the suburbs. In addition, the development of the automotive industry was very important for the development of the suburbs. It reached its peak only after the Second World War when the soldiers returned from the war. Then there was the baby boom and for that reason began to create more suburbs because there was not enough space for all the inhabitants in the centers of the cities. The development of suburbanization can be described in the example of the City of Zagreb. The example of Zagreb highlights the municipality of Bistra which has become a very attractive suburb. Apart from many advantages (clean air, spring water, nature) there are also some drawbacks (underdevelopment of infrastructure and cultural events). The development of the city dates back to the Paleolithic and Neolithic periods. The first cities were created in 5500 years ago in Mesopotamia. Cities had important functions such as religious function, military, cultural and economic functions. As the cities grew more and more, the velegrads were born. So today there are many modern big cities. Among the three most modern cities in the world are Tokyo, Singapore and Tallinn. But many modern cities remain without resident due to natural disasters, wars and political reasons. Also, many modern cities are struggling with pollution problems. Fossil fuels can be the main cause.