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. F-0Ud V  
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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? %xg"Q
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this is the initial list I am working off: cdp0!W4Gi  
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london i^|@"+  
paris ,seFkG@1  
Rome X , ZeD  
Venice MV936  
Florence ? tHI*,  
Viena jXIE
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Prague D s -`  
Berlin ? =HE m)  
Zurich =MSu3<y,  
Madrid ? gg]~2f  
Lisbon ? Z;<ep@gy~  
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too aggressive? moO_-@i  
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Thanks in advance