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. BQWgL  
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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? vzfMME17  
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this is the initial list I am working off: g)Hsd0  
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london L`<#vi  
paris x*F-d2D  
Rome q['D?)sy  
Venice /y{fD CC  
Florence ? 7Dssr [  
Viena -6-rXD  
Prague ;0kAm Vy  
Berlin ? tgCp2`n  
Zurich )?ra
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Madrid ? nHbi{,3  
Lisbon ? p2l@6\m\  
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too aggressive? _J\zj  
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Thanks in advance