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. 9q&~!>lt  
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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? #KHj.Vg  
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this is the initial list I am working off: ^AZv4H*~  
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london h: FN&E c}  
paris C+t
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Rome 3Y +;8ld  
Venice B7[#z{8'#  
Florence ? sE{5&aCSR  
Viena gdyWuOx a|  
Prague L UpkO  
Berlin ? Y[rCF=ZVH  
Zurich &H}Xk!q5b^  
Madrid ? ={
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Lisbon ? U!BZsVx  
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too aggressive? QMX  
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Thanks in advance