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. q?$<{Z"  
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I have noticed that a number of you are from Europe, can you please offer some suggestions on how best to plan our trip? what will be interesting for girls around 10 years old? _FxQl]@  
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this is the initial list I am working off: d)1Pl3+  
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london ? t_$C,A+  
paris B&Iy_;  
Rome pxV@fH+`  
Venice 5Y#~+Im=[@  
Florence ? ,M0#?j>  
Viena <G60R^o  
Prague w$$vR   
Berlin ? OM (D@up  
Zurich -F&*>?I  
Madrid ? 9B
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Lisbon ? Dssecc'  
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too aggressive? 3-4CGSX;X  
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Thanks in advance