This study discusses copious early Arab literature of "wonders and marvels". The authors of such books found their materials in the Muslim religion, in the ancient Arab heritage and in strange facts about other cultures. The study examines the themes addressed by these works, including magic, fantasy, strange customs, curiosities, humor, the absurd, mockery, nightly chats, puzzles, riddles, rebuke, satire, defamation, battles, animals, angels, demons, etc. Composers of "wonders and marvels" books chose rhyming names for their works in order to attract the reader. The study found that the popularity of such books was due to the fact that certain phenomena and customs were perceived as incomprehensible by Arabs, who therefore sought transcendental or supernatural explanations, giving free rein to their imagination. Some books of this genre were apt to arouse fear in the reader and the oft-repeated stories in them were eventually believed by many and became means for realizing Arabs' desires and dreams. The study found that at first such books were perceived with scorn, as collections of superstitions and myths, and were therefore popular mainly among the lower classes. Because the genre did not attract the interest of the more educated, its scholarly study was neglected for a long time.