Is Tower of London haunted?
England Reported haunting level 4 of 5

What actually happened
Anne Boleyn was executed on Tower Green on 19 May 1536 after a trial widely understood to have been engineered by the Crown.
The history
William the Conqueror began the fortress in the 1070s. It later served as a royal residence, prison and execution site; Anne Boleyn was executed within its walls in 1536.
What people report
Visitors and guards have long reported apparitions associated with Anne Boleyn, Lady Jane Grey and other former prisoners.
That paragraph is reported tradition, not a claim about what is there. The history above it is sourced; the stories are recorded because people tell them.
Visiting
London EC3N 4AB, United Kingdom