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. 8UW^"4  
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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? KK1gNC4R  
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this is the initial list I am working off: -MW_|MG  
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london HFKfkAl  
paris ~k\fhx  
Rome @E;=*9ek{u  
Venice q4R5<LW"  
Florence ?  J}htu  
Viena LIS)(
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Prague
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Berlin ? x*![fK  
Zurich -d~4A  
Madrid ? b=g8eMm  
Lisbon ? zO~8?jDN4|  
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too aggressive? TlXI|3Ip  
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Thanks in advance