A ten-day-long ghost festival has just begun in Oxford, in an attempt to find out if it is one of the most haunted cities in England.The event, which began at the Oxford Castle on Friday, will involve a week-long experiment into paranormal activity around the complex, where ghost-hunting experts will try and record any occurances using dictaphones, cameras, camcorders and laptops.For festival-goers, there will be plenty to get involved in, including ghost walks, ghost hunts, mediumship demonstrations and psychic workshops.Martin Jeffrey, Director of Fright Nights, said: "Oxford is famous for its university but people have not recognised how historic Oxford is from a haunting perspective. We have been literally amazed."We're finding that Oxford is a real centre for hauntings and you can go down literally any street in Oxford and get lots of stories."