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`N^H:
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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? ($r-& ]y  
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this is the initial list I am working off: Q6rvTV'vv  
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london jdAjCy;s!  
paris )lrmP(C*.a  
Rome \d}>@@U&  
Venice  &'<e9  
Florence ? I7e.pm  
Viena LF\HmKM,  
Prague cMp#_\B  
Berlin ? 6$A>%Jtwe  
Zurich /K\]z Pq  
Madrid ? x /E<@?*:  
Lisbon ? KetNFwbUf
 
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too aggressive? :pvJpu$]  
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Thanks in advance