[Kazilan]

I spent a week in London just walking around and visiting museums, so if you go plan for a long stay. Noone has mentioned the Tate Modern yet, which is fantastic if you like art, and still amazing even if you don't. As stated before you also must visit the British Museum. I only had one day there and it wasn't enough. If you have an interest in history you'll probably want to visit it twice.

There is a ton of stuff to see, take Variol's advice and do a tour the first day, then pick a particular area near a museum you are interested in and walk around after your visit. I recommend the National Gallery, another great art museum, and after touring it you can walk through Trafalgar square and around downtown. There are all sorts of walking tours day and night, be sure to visit a tourist information booth to pick up brochures.