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. bf.yA:~U  
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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? wOLV?Vk  
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this is the initial list I am working off: KOoV'YSC[(  
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london x:h)\ %Dg<  
paris '&$zgK9T?  
Rome 4YoQ*NQw-  
Venice #o,FVYYj  
Florence ? (W}DMcuSd  
Viena |:,`dQfw  
Prague vP\6=7 1Y  
Berlin ? =5:S"WNj  
Zurich 4J?\JcGs  
Madrid ? Z~[eG"6zI  
Lisbon ? -9Ygn_M  
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too aggressive? TX7dwmt)N  
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Thanks in advance