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. /c:78@  
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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? ;xxu,  
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this is the initial list I am working off: %;MM+xVVX  
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london QopA'm  
paris T1[B*RwC  
Rome tR`^c8gD  
Venice xh`4s  
Florence ? &A!?:?3%O  
Viena cy @",
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Prague =jIP29+  
Berlin ? + ko-oZ7V  
Zurich ;:A/WU.^  
Madrid ? ,?/AIL]_  
Lisbon ? UsQh
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too aggressive? d;FOmo4  
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Thanks in advance