mary king's close

Edinburgh and the weird Hello! I've just moved recently to Edinburgh, and was wondering if anyone knows of any particularly interesting paranormal places or events (I'm a student, I've got lots of time on my hands ;) ). Living in the shadow of Arthur's Seat and Salisbury Crags is...

Has anyone been down there or even experienced anything while having a look round? Interested to hear thoughts and opinions on this as im thinking of trying to get a group together to go there.