Mall of America is about 7 times bigger than Colosseum.

Colosseum is approximately 0.019 km² (0.0075 sq mi), while Mall of America is approximately 0.14 km² (0.053 sq mi), making Mall of America 613% larger than Colosseum.
Tip: This to-scale comparison of Colosseum vs. Mall of America uses the Mercator projection, which distorts the size of regions near the poles.
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