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. $DE&J4K  
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I have noticed that a number of you are from Europe, can you please offer some suggestions on how best to plan our trip? what will be interesting for girls around 10 years old? `{o$F ::(  
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this is the initial list I am working off: OaaH$B  
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london 8wmQ4){  
paris !iJipe5  
Rome V;;#/$oU:4  
Venice P)hi||[  
Florence ? .&|L|q}  
Viena w & P&7  
Prague (O0byu}  
Berlin ? "V}qf3qU  
Zurich NzlAC  
Madrid ? 9!#EwPD$#  
Lisbon ? v2>Z^  
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too aggressive? M*`hDdS  
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Thanks in advance