Interesting this, my dd when she was 6 decided that she wanted to go on the London eye. It was to be her holiday treat. She absoluetly loved it - as did dd2 who was 4. She saw (and remembers 18 months on) buckingham palace, westminster, st pauls etc. And it gave her a list of places she wanted to vivit.
We have a 'thing' that my kids get to go to London once in the holidays for a day out, and they can choose where they go!
Open topped bus has been another HUGE sucess, loved that too. They now really want to visit buckingham palace and st pauls, and all the churches in the rhyme 'Oranges and Lemons'!!
I am trying to work out a route for that one
Eden was dull and pricey, Stonehenge is a let down due to the fences, best art gallery for me is National Gallery with Trafalgar Square. Free and good paintings, nice loos and good staff