The densest cities in the world

Some cities are more populous than others and therefore have a high density ratio. This is due to the better quality of life within these metropolises while in others it is because of the high birth rates within these settlements. Some of these cities are amongst the most visited and attractive in the world. In many cases these high levels of population have disastrous effects on the transportation infrastructures and pollution rates which ultimately make these cities unwelcoming towards their residents.