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. )wEXCXr!  
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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? :4\_upRE  
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this is the initial list I am working off: jC-`u-_'j  
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london 11!4#z6w  
paris K|;L{[[yH  
Rome .Rb4zLYL*w  
Venice '&]6(+I>  
Florence ? ~jWp D7px  
Viena ~PN[ #e]  
Prague gaU^l73,C  
Berlin ? p@?(m/m$  
Zurich 5a&gdqg]  
Madrid ? V Kc`mE  
Lisbon ? k?Zcv*[)D+  
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too aggressive? 1P BnGQYM  
((BdT:T\_  
Thanks in advance