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[U=O  
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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? u1kbWbHu(  
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this is the initial list I am working off: |Z/ySAFM  
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london hg>YOf&RG  
paris }w@nZG ^ &  
Rome jH G(d$h  
Venice Yr,1##u  
Florence ? tE>:kx0*3  
Viena nBj7Q!lW  
Prague +%~g$#tlJo  
Berlin ? QBo^{],  
Zurich 4%{m7CK}  
Madrid ? wIiT
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Lisbon ? gddGl=rm  
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too aggressive? zj)[Sntn?  
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Thanks in advance