Nightmare on 13th is a haunted house in Salt Lake City, Utah. It is one of the largest and longest-running haunted attractions in the United States and is considered one of the best and scariest in the nation. As of 2022, they have been in business for 32 years, and over 60,000 people attend Nightmare on 13th each season. More than 1.5 million people have visited this haunted house. Nightmare on 13th has been voted one of America's scariest attractions by the Travel Channel.