Poor People Lived in High Rises
Rome was one of the first cities to house more than one million people. Of course, that meant they all needed somewhere to live, and the streets of Rome were famously extremely overcrowded with people and housing.
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Their solution was to build upward instead of outward, creating high-rise apartment buildings called “insula”, standing up to 100 feet tall. The bottom floors were saved for those with more money, while poorer people were stuck at the top, at risk of fire and crumbling infrastructure.