San Siro Stadium
The San Siro Stadium (officially called Stadio Giuseppe Meazza) is an impressively huge football stadium in Milan. In fact, it's one of the largest stadiums in all of Europe. The two Milanese Serie A football clubs - AC Milan and Inter Milan - call it home.
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With the 48hr bus ticket, Casa Milan museum, lovely lunch and San Siro it was really worth the money.
If you did these things separately it would be much more expensive.