Interesting. Snapshots around the world. It's divided into three sections, based on geographical sections - europe, asia and the americans.

There are a wealth of underground locations so this only covers a few highlights, mostly with the feeling the author has personally visited them, there are a few notes for visitors. However it also means there are a few notable absences, when you know the areas involved. For instance the london underground is featured, but there is no mention of the abandoned stations which are visitable and would be of greater interest to tourists specialising in underground locales.

It's well illustrated with photos on every double page the highlights of the attractions. There were two prinigning blemishes in this copy, but oteherwise it's of high quality with heavy paper reproducing the images crisply and brightly. Within each area there are several key attractions and then shorter summaries of a few similar locations that might also be interesting. Most of the locations are man-made either completely excavated or substantially adapted in the nature of temples and the like. There are a lot of religious/church based cellars and shrines. Very few fully natural features get a look in, even when they are adapted for tourist access without requiring any specialist equipment or training. None of the world's showcaves feature, and some of these are among the great natural wonders oft he world. For a book specialising in subterranean features this seems a curious omission. Hence none of the locations are also particularly deep, frequently less than 100 ft. It is an American curiosity that all the units are imperial without metric equivalents being offered at all. ( )