London

I live around an hour and a half from London but there are still lot's of parts of it I've never been. I've been going there a lot more lately (boy lives there) and this weekend we went to Portobello market. It was my first time there and it was VERY busy but well worth a visit. It's got me thinking about other things I've never seen there like the cathedrals or the tower...

Were do you recommend for the next time I visit?