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. (]_smsok  
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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? dBWi1vTF  
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this is the initial list I am working off: g2Hz[C(  
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london L<7KmN4VX  
paris 2F}D?]A  
Rome 'P AIh*qA  
Venice Rcn6puZt  
Florence ? M0jC:*D`"  
Viena n]%T>\gw  
Prague wBuos}/  
Berlin ? )9pRT dT  
Zurich `G@(Z:]f,t  
Madrid ? i1c z+}  
Lisbon ? b0(bL_,  
g-C)y 06  
too aggressive? i%FpPni  
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Thanks in advance