Like all living things, cities have lifespans.
Some, like Paris, are ancient — over 2,000 years old. Others are adolescent in comparison, like Sydney, at just over 200 years old.
Here are the maps, paintings, and old-time photographs that show the journeys of our greatest cities.
Between 1870 and 1915, New York's population tripled -- surging from 1.5 million to 5 million residents. In this 1900 photo, Italian immigrants crowd the Lower East Side's Mulberry Street.
So the city invested in infrastructure -- like the Manhattan Bridge, pictured here in 1909 -- to support its burgeoning population.
Many woodblock artists depicted the quiet beauty of the place, with Mount Fuji presiding in the background.
By 1905, Tokyo was already industrialising. Here's what the city looked liked after Japan won the Russo-Japanese War.
This card from 1930s reads 'Come to Tokyo,' and features cherry blossoms in front of modern and traditional architecture, plus the city's trademark elevated railway.
Archaeologists say that the first people to settle Paris were the Parisii, a Celtic tribe that set up a settlement on the Seine at around 250 BC.
By the early 1400s, when this painting was made, Paris was already one of Europe's largest cities, if not the largest. That's the Palais de la Cité, a castle on the Île de la Cité, behind the wall.
Located along the Huangpu River in central Shangai, The Bund neighbourhood became a global financial center in the late 1800s, featuring trading houses from the US, Russia, the UK, and Europe.
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