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. x~nQm]@`h  
j37:  
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? 1MpX] j8C#  
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this is the initial list I am working off: a 1NCVZ  
1P \up  
london #]igB9Cf)w  
paris u,\xok"  
Rome 5/k
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Venice p[b7E`7  
Florence ? !bieo'
c  
Viena 4V1|jy3   
Prague %~G0[fG  
Berlin ? $CM4&{B"i  
Zurich p#z;cjfSt  
Madrid ? F46O!xb%  
Lisbon ? 1-/ 4Y5?}  
\1~I04'=  
too aggressive? }Py<qXH  
P$Axc/H  
Thanks in advance