There are tens of stadiums.
Cagliari , Italy
I would have to say San Siro stadium mainly because that's where A.C Milan plays and there the best team in Italy.
Vercelli , Italy
Casale Monferrato , Italy
Moses Mabhida Stadium.
It is called the Loftus Versveld Stadium of Pretoria.
The largest stadium by capacity (150,000 people) is the Rungrado May Day Stadium in Pyongyan North Korea. It is primarily used for Soccer but it is not a Soccer specific Stadium. The largest Soccer specific stadium in the World is the Estadio Azteca (105,064 people) in Mexico City.
Stadio Olimpico Rome, Italy
Stadio Olimpico Rome, Italy
The Rungrado May Day stadium is the largest soccer stadium in the world.
Stadio Marc'Antonio Bentegodi , Verona , Italy