The Enchanted World was a 21 volume set published in the mid 80's. These books were the pre-cursor of the very popular Mysteries of the Unknown series and each volume is large and has a colorful cover.
Each volume of this series deals with one aspect of popular mythology. Some of the topics covered are very interesting and there isn't really too much written on them, which is a plus. The books come off as more entertaining than informative, though, but they are pretty good anyway.
This set originally came with a set of gypsy fortune telling cards for subscribers. These cards are now becoming as much of a collector's item as the books themselves, so if you have them hang on to them!