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. +2 oZML  
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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? d JnKa]X  
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this is the initial list I am working off: RfD#/G3|  
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london o&@y^<UQ  
paris DBcR1c&<H  
Rome VWK/ (>TP  
Venice XP}5i!}}7=  
Florence ? F}meKc?a  
Viena dz/fSA  
Prague u1u;
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Berlin ? ^OIo  
Zurich : fYfXm  
Madrid ? SnXM`v,  
Lisbon ? ,P`GIGvkA  
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too aggressive? 4xalm  
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Thanks in advance