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. ;/A}}B]y  
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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? NhlJ3/J j  
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this is the initial list I am working off: ,V2#iY.%}N  
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london 2]Fu 1  
paris @a;sV
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Rome gE=Wcb!  
Venice hmzair3X  
Florence ? twbcuaCTW  
Viena yV_ L/,6}D  
Prague -- S"w@  
Berlin ? i+U51t<  
Zurich Q
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Madrid ? (4ZLpsbJ  
Lisbon ? wO.B~`y  
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too aggressive? # ITLz!gE  
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Thanks in advance