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. r!7Y'|  
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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? J1bA2+5.*e  
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this is the initial list I am working off: &uv0G'"\  
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london b/t  
paris n-$VUo  
Rome \i!Son.<  
Venice baee?6  
Florence ?
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Viena 6SVqRD<`  
Prague ` @8`qXg  
Berlin ? f/,tgA  
Zurich 'n0 .#E_  
Madrid ? RPVT*`o  
Lisbon ? mLwoi!]m  
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too aggressive? [8"ojhdV  
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Thanks in advance