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. 8M m, a  

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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? $a(EF 6  
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this is the initial list I am working off: ;+XiDEX0}  
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london EJP##eGx  
paris iivuH2/~?[  
Rome 1_uq46  
Venice I^'kt[P'FZ  
Florence ? mc_`:I=  
Viena <7TE[M'  
Prague SS@F:5),  
Berlin ? is`Eqcj`dr  
Zurich Rt{qbM|b&  
Madrid ? (9x8,f0z  
Lisbon ? 1P&XG@  
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too aggressive? {.2A+JT,  
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Thanks in advance