In 1994, Kristina Bishop vanished while walking to school in Columbia, Missouri. The last sighting of the 14-year-old was when she spoke to a male driver of a four-door vehicle on her street. Kristina entered the car and drove away, and she never arrived at school. Although she had run away from home once before, her disappearance has been classified as an endangered missing child. Authorities aren't sure whether Kristina left of her own accord, and she may have been accompanied by a 22-year-old male when she vanished. The case remains unsolved.