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. ^`aw5 +S  
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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? H.C*IL9  
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this is the initial list I am working off: z7L+wNYwg  

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london |M t2  
paris .f;@OqU  
Rome #.fJ M:"tG  
Venice k\*?
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Florence ? dn?'06TD  
Viena D)l\zs%ie  
Prague t0v>J9  
Berlin ? |22vNt_  
Zurich [q_62[-X  
Madrid ? ,L~aa?Nb-  
Lisbon ? b\o>4T  
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too aggressive? c9Cc%EK  
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Thanks in advance