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. 0'Pjnk-i  
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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? op6]"ZV-C  
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this is the initial list I am working off: fkxkf^g)  
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london cJo%j -AM  
paris ")Fd'&58  
Rome ppAbG,7  
Venice $Rm~ VwY#  
Florence ? t+?Bb7p,H  
Viena A,~3oQV  
Prague V!Wy[u  
Berlin ? UleT9 [M  
Zurich hfwJZ\_60  
Madrid ? d0aXA+S%  
Lisbon ? LqWiw24#  
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too aggressive? t#NPbLZ  
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Thanks in advance