(Salt Lake City, UT) -- Elizabeth Smart is opening up about her nine-month kidnapping ordeal. In an interview with NBC News, Smart described the night she was kidnapped from her Salt Lake City home at knifepoint in 2002 and forced to hike to a makeshift campsite, where she was forced into a bizarre marriage ceremony and raped. Smart was only 14-years-old when she was abducted by religious fanatic Brian Mitchell. During the interview, Smart returned to the site where the infamous campsite once stood. Smart is telling her whole story in a memoir being published this week. It's called "My Story."