Help needed! what to see in Europe with kids

I am taking my two daughters to see Europe first time this summer, most likely flying into London and hop on Eurail. two weeks is about what I can afford. nZ2mY!*  
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I have noticed that a number of you are from Europe, can you please offer some suggestions on how best to plan our trip? what will be interesting for girls around 10 years old? %7~~*_G  
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this is the initial list I am working off: Lk|%2XGO&  
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london 5 J9,/M0  
paris S20L@e"U  
Rome r8E)GBH-|  
Venice k9<P]%  
Florence ? 2U;ImC1g  
Viena g4 |s9RMD  
Prague L.@o  
Berlin ? &qP&=( $  
Zurich 6-<>P E2  
Madrid ? 0 ))W [  
Lisbon ?
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too aggressive? Sc zYL?w^  
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Thanks in advance