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. fQoAdw  
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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?  /~"-q  
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this is the initial list I am working off: ZdW+=;/#  

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london P y'BMk  
paris o-<i+To%  
Rome M^kaik  
Venice ~^F]t$rz  
Florence ? ~>:JwTy  
Viena 2Io|?  
Prague Pp?P9s{  
Berlin ? v^C\ GDH  
Zurich \]
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Madrid ? KMhrw s{&B  
Lisbon ? q`e0%^U  
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too aggressive? aCU[9Xr?  
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Thanks in advance