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. v"y-0$M  
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I have noticed that a number of you are from Europe, can you please offer some suggestions on how best to plan our trip? what will be interesting for girls around 10 years old? 0!4Ts3qn1  
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this is the initial list I am working off: H`*LBqDk  
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london 3atBX5  
paris =2`[&  
Rome D#_3^Kiawj  
Venice 1h^:[[!c  
Florence ? 5#HW2"7  
Viena 4X!/hI=jq  
Prague "IZa!eUW  
Berlin ? Gj1&tjK  
Zurich ux=w!y;}  
Madrid ? {j{u6i  
Lisbon ? !S$:*5=&  
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too aggressive? xsIY7Ss U  
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Thanks in advance