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. 6\; 4 4,3  
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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? u)<Ysx8G  
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this is the initial list I am working off: %M|Z}2qv  
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london @WhZx*1  
paris MDMtOfe|  
Rome aQz|!8Is  
Venice ~%olCxfO  
Florence ? C!oS=qK?]  
Viena 5W*7q D
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Prague pWWL{@ J  
Berlin ? Xg|8".B)A  
Zurich }wvwZ`5t  
Madrid ? 'CP/ymf/a  
Lisbon ? Nr>c'TH  
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too aggressive? r^?)F?n!  
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Thanks in advance