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. 9^9-\DG  
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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? icX4n  
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this is the initial list I am working off: \#xq$ygg  
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london  WzoI0E`  
paris h@Jg9AM  
Rome al B'l  
Venice <f`n[QD2z  
Florence ? 0w:
3/WO  
Viena :<mJRsDf  
Prague `N&*+!O%  
Berlin ? xticC>  
Zurich Bz <I7h  
Madrid ? W/%hS)75  
Lisbon ? =3 6fS/Gb  
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too aggressive? 1r};cY6  
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Thanks in advance