Compare the Colisseum to modern structures beyond stadiums. What modern structures have similar roles or importance?
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To answer this, you have to figure out what the Colosseum's role or importance was. In a previous answer, I talked about how it came to be a symbol of the power, riches and glory of Rome. So you would have to think about what modern structures show similar things about their societies.
To me, what comes closest to filling this role in our society are monumental, huge buildings. These would be things like the Petronas Twin Towers in Kuala Lumpur or the Sears Tower in Chicago. These are buildings that have a role beyond their primary role as office buildings. They also serve to show off the power and wealth of the societies that produced them.