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. dP<=BcH>f  
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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? 6ZG+ZHUC&  
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this is the initial list I am working off: Vjp1RWb  
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london B43HNs  
paris vAh6+K.e  
Rome e .2ib?8  
Venice eWtZ]kB  
Florence ? 9- YwkK#z  
Viena
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Prague ke]Lw  
Berlin ? b8"?VS5-"  
Zurich NOiN^::m  
Madrid ? ],FMwCI  
Lisbon ? {/(D$"j(S  
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too aggressive? q6SXWT'Sa  
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Thanks in advance