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@Q|oB0W$)  
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I have noticed that a number of you are from Europe, can you please offer some suggestions on how best to plan our trip? what will be interesting for girls around 10 years old? u%ih7v!r\  
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this is the initial list I am working off: S2j7(T;~YB  
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london d7KeJ$xy}p  
paris =X+DC&]%!  
Rome ?9=yo5M}  
Venice ?6uh^Qal  
Florence ? \k;raQR4t*  
Viena P+
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Prague F(SeD)ml  
Berlin ? vs6`oW"{#  
Zurich /R t/Efu  
Madrid ? %y8w9aGt  
Lisbon ? 3PBg3Y$  
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too aggressive? 7g(rJGjtg  
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Thanks in advance