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.
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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? jNx{*2._r  
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this is the initial list I am working off: 6<@+J  
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london 8F<|.V;  
paris >lM/\HO2  
Rome C3^3<  
Venice IT=y+  
Florence ? m4h)Wq  
Viena &Y@),S9  
Prague Z1
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Berlin ? Y?1T XsvF  
Zurich DM v;\E~D  
Madrid ? clyp0`,7  
Lisbon ? /,uxj5_cT  
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too aggressive? Zs t)S(  
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Thanks in advance