We are In London in April and want to find something fun but not ridiculously expensive, our 2 girls are aged 15 and 13 (trip is birthday treat for her 14th a couple of days later), we are doing a show the night before, want something fun not too childish. We have done science museum and London eye. Older would spend day shopping but younger one (the birthday girl) would hate that. Thinking of Tower of London or Dungeons , anyone got any thoughts or ideas would be appreciated, thanks X