Unexplained: An Encyclopedia of Curious Phenomena, Strange Superstitions, and Ancient Mysteries Hardcover – October 4, 2006 by Judy Allen 
 
Unexplained is a comprehensive and compelling one-stop guide to weird nature, the paranormal, and strange superstitions. Even with today's high-tech science, many events and ancient mysteries remain unexplained and surrounded by theories that stir the imagination and challenge scientific fact. This book systematically explores all aspects of the human fascination with the unknowable, from hauntings and the power of the mind to physical mysteries such as lost civilizations, ancient superstitions and symbols, and the persistent ideas about life from other planets. Evocative illustrations and intriguing photographs, combined with spine-tingling text by an award-winning author, shed light on the world's greatest mysteries.
 
4.10