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. ha'm`LiX  
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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?
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this is the initial list I am working off: y]z#??  
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london HE.Dl7{  
paris 3G0\i!*t  
Rome Gqu0M`+7  
Venice RPqn#B  
Florence ? !~DkA7i55  
Viena t$ ~:C  
Prague @[N~;>  
Berlin ? +( 7vmC.  
Zurich f2K3*}P  
Madrid ? w0>)y-  
Lisbon ? ]tV{#iIJ*  
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too aggressive? k 5\ zGsol  
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Thanks in advance