Athens is a relatively small city in terms of population as 600.000 people live within its city limits. However the wider metropolitan area of Athens includes in total 41 different cities and most of them have indistinguishable city borders making Athens a haotic metropolis which is the 4th most populated capital of European Union with 4 million people. Two of the cities of the metropolis (Kalithea and Nea Smyrni) are in the list of the top ten more dense populated cities in Europe with more than 21 thousand people living per square kilometer. As a comparison reference New York's most dense populated areas have 19 thousand people per square kilometer. Despite the efforts of decentralization of the population of Athens, currently the 40% of the population of Greece still lives in the wider metropolitan area.
Photo taken at Athens, Greece