Quite overrated and expensive in my opinion. It's ...

Quite overrated and expensive in my opinion. It's basically a collection of small, seemingly unrelated, museums. The buildings themselves (especially the central White Tower) are nice but not that impressive compared to St Paul's, the houses or parliament etc. The most popular section is the crown jewels. Expect queues for this on a busy day and a long 'hype' line before you actually get to see the jewles, which I felt were underwhelming. There is a tiny but interesting museum section on torture, and another on animals that have been kept in the tower. But overall, I'd recommend avoiding the Tower Of London unless you have already visited the impressive buildings mentioned previously and been to some of London's great free museums like the British Museum.