Los Angeles is home to over 13 million people who collectively make up one of the most multicultural places in the world; with over 80 neighborhoods making up a rich, diverse hub, LA's polycentrism is certainly its greatest asset.

Germany's capital city, Berlin, is a place of many contradictions. In 1961, the city was reunited, but decades of isolation left deep-rooted urban and social scars and lasting international repercussions.

Calgary, Canada's oil capital and Alberta's biggest city, is more often associated with the Stampede, cowboys, oil drilling, suburban sprawl and highways. But its economy is now diversifying, and so is the population.

The magnificent, multi-layered city of Istanbul has seen its population multiply twelvefold in the past 60 years.

Although Antwerp was once one of the biggest ports in the world, it no longer has the loud notoriety of some of the world's other cities.