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. CqVeR';2  
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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? y>! 8mDvZ  
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this is the initial list I am working off: wl.a|~-  
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london h1 npaD!  
paris pNnZ-R|u  
Rome 4 \Ig<C9  
Venice 5._1G| 3  
Florence ? t6C2DHh7$  
Viena J`[v u4  
Prague Fm#`}K_  
Berlin ?
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Zurich e0:[,aF`  
Madrid ? , G2(l  
Lisbon ? ZBuh(be  
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too aggressive? SNOML7pd  
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Thanks in advance