It didn't start with The X-Files. Since at least the nineteenth century, human beings all over the world have held the conviction that interaction with extraterrestrials, angels, fairy-folk, other-dimensional intelligences, hollow-earth inhabitants, and a whole range of fantastic beings is not only possible - but frequent. Arising both from the paranormal and imaginative experiences of individuals and from mass belief in unearthly entities and realms, these beings are said to play an unseen role in humanity's history and future. Extraordinary Encounters: An Encyclopedia of Extraterrestrials and Otherworldly Beings is the first-ever illustrated A-to-Z encyclopedia to explore these fascinating modern-day beliefs, personalities, beings, and events. An amazing amalgam of folk religion, folk science, pop culture, and fantasy, this offbeat encyclopedia will intrigue, excite, and scare the wits out of readers of all ages.