This is a delightful book. The entries are, on the whole, well written in a sort of "travel guide" fashion, with occasional snippets of advice for individuals visiting the places described. There are maps provided of many of the locations, which are universally excellent. Unfortunately, there are glaring gaps in the work's coverage, the reasons for which are never made clear. There's no sign of Moorcock's Melnibone, for example, nor any of Howard's Hyborian or Thurian kingdoms; Burrough's Pal-ul-don and Pellucidar are there, but not Barsoom or Amtor. Whilst there may be copyright issues in some cases, it is interesting that the authors have managed to cover Middle Earth, Narnia, Earthsea, Hogwarts, etc, with little difficulty.
An excellent guide as far as it goes, and very useful for tracking down all those places mentioned in the almanac at the back of the "League of Extraordinary Gentlemen", volume 2, the omissions take it down from five to four stars.