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. &-l8n^  
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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? BG`s6aC|z<  
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this is the initial list I am working off: I
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london 1MsWnSvzf  
paris 9<Eg}Ic  
Rome j`*N,*ha  
Venice 4Cb9%Q0  
Florence ? ITJ q  
Viena XE3aXK'R  
Prague &a)eJF]:!  
Berlin ? F!!N9VIC  
Zurich cR{>IH4^  
Madrid ? l;X|=eu'  
Lisbon ? * A|-KKo\  
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too aggressive? 10[Jl5+t  
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Thanks in advance