The best depository of dark tourism resources must be the the University of Central Lancashire's Dark Tourism Forum which has a long list of links to books, scholarly essays and media articles on the subject. Their definition of dark tourism also takes in a prison tourism and the specialised area of Holocaust tourism and genocide tourism. The body of articles on the site testifies both to an increase in interest in researching and writing about dark tourism in recent years as well as to an actual increase in the popularity of dark tourism. For instance, take a look at Post 9/11 Dark tourism booms, which states that 2.2 million people visited Ground Zero in 2002, and Visiting sites of tragedy to touch history, ease grief (CNN.com, 2008) which claims that 5.6 million visited the Ground Zero site in 2006. The Guardian and The Observer are another great source of articles; they've given dark tourism extensive coverage in recent years, with a number of first-hand accounts of dark touristic experience from Sarah Johnstone's Strange and unsettling: my day trip to Chernobyl (Oct, 2005) to James Hopkirk's visits with prisoners in Checking in to the Bangkok Hilton (also Oct, 2005).