it is a campanula all right... then there is a little bee trying to land on it - it is a leafcutter bee (here is my spotting: http://www.projectnoah.org/spottings/6541726)
and that little pink flower beside it is surely a Epilobium family member (not quite sure which one)
What are you not sure about? If it's not Campanula, it may be a white flowered variety of Balloon flower.
http://en.wikipedia.org/wiki/Platycodon_grandiflorus
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