Compare the Colisseum to modern structures beyond stadiums. What modern structures have similar roles or importance?you can answer by your own...

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.