I'm trying to put together a summer itinerary for travel with our two kids, aged 8 and 3. My daughter got to spend a couple days in Paris earlier this year and wants to go back, so we plan to either start or end in Paris, but use planes or trains to do one or two other destinations. We've done a good portion of Italy except for Milan/Tuscany. My wife and I have done London and Barcelona. Any recommendations on destinations the kids would enjoy spending a few days in? I've spent time looking at Luxembourg, Brussels, Amsterdam, Germany and can't decide what to check off the list next.