A frightening experience !
On a monthly basis the Peterborough museum offers 'Ghost walks' around the centre of town.
I've not been on one myself, but I'm told they are very good. The tour does not offer 'gimmicks' such as out-of-work actors jumping out at you, as happens elsewhere.
All the stories have a provenance of sorts, in that they have been researched carefully.
The tour lasts about two hours, but is not recommeneded for those under 10, or those of a nervous disposition !