Witches and demons, ghosts and vampires, aliens and voodoo spirits? from spooky to chilling to downright weird, signs of the supernatural have terrified -- and fascinated -- people for centuries. Dare to discover some of the world's most puzzling enigmas in this remarkable book, which reveals a dazzling array of haunted castles, forbidden hideaways and otherwise eerie landmarks. Packed with rich illustrations, National Geographic's first-ever guide...