New York's commuter nightmare is bad, but the world's most crowded cities are even worse

A July 17 track fire at New York City's 145th St. station caused citywide delays for commuters, and it was just the latest in a recent string of subway failures.

Over the past several months, multiple delays have led to crowded platforms where hordes of sweaty bodies squeeze together. An overworked subway system is to blame.

The same is happening around the world, and on a far more concerning scale. By the year 2050, 70% of the world will live in cities, according to the Population Reference Bureau.

The most population-dense cities grapple with unique challenges. They fight for resources, like housing and personal space, and they put infrastructure to the test.

Here's just a taste of what life is like.

SEE ALSO: Manila is the most crowded city in the world — here’s what life is like

New York City is the densest city in the US. One square mile contains more than 27,000 people, and it's led to countless delays for commuters. But claustrophobic as it may seem, it barely stacks up against the world's most crowded cities.

Source: NYC Population

Consider Manila. With a population density of 107,000 people per square mile, it's the most crowded city in the world.

Manila's fertility rate is 3.1 children per woman. Experts predict the population will double by 2025, despite fears the city's infrastructure can't sustain the boom.

Source: World Population Review

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