Yvette Fielding and a team of experts visit Derby, which is reported to be the most haunted city in Europe. Throughout the ages it's been a Roman fort, trading post, Saxon village and viking town. Over the years it has always been a very busy city with a lot of history and thousands of people have passed through this bustling place each day for hundreds of years. So, it's no surprise that Derby is said to be one of the most paranormally active cities in the world.