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. *l0i}"T^_  
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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? CJ#Yu3}  
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this is the initial list I am working off: Tn38]UL  
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london s <$*A;t  
paris eR3MU]zF  
Rome F:0 E- z'  
Venice `@:k*d  
Florence ? ?iaO6HD  
Viena T0\[": A  
Prague -*?{/QmKb  
Berlin ? )^E6VD&6  
Zurich {w99~?  
Madrid ? Pb@$RAU63  
Lisbon ? REk^pZ3B  
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too aggressive? ZQ_~ L!ot  
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Thanks in advance