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. -?}Z0e(w
 
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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? .sBwJZ  
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this is the initial list I am working off: )0UXTyw^  
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london ;'i>^zX`  
paris +rN&@}Jt.  
Rome 6*r#m%|   
Venice mK_2VZj&  
Florence ? +DwE~l  
Viena mnm 7{?#[  
Prague LE]mguvs  
Berlin ? #C#*yE  
Zurich u [Dz~  
Madrid ? >p?Vv0*  
Lisbon ? oUNuM%g9Dy  
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too aggressive? ,9YgznQ  
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Thanks in advance