I've been interested in Ancient Greece and Rome ever since I was a child (Which wasn't that long ago), but I have never done a formal degree in the Classics. If I had studied the subject then I would have found this book invaluable.
It's basically a series of very short essays that cover every aspect of the Classical World, from politics and biography to literature; military; science and philosophy; art; food and drink; economy; law; geography; mythology; religion and social history. It also provides information on archaeological topics.
The book mentions virtually everything about the Classical period. For instance, if you were to pick the book up and look through the 'C' section, you'd find on the first few pages topics such as Cabiri, Cacus, Cadmus, Caecilia Attica, Caecilia Metella (1), Caecilia Metella(2) and so on.
Every topic is written by an expert on the subject, and a short bibliography is given at the end of every entry so that you can check up on their sources.
Some entries have more space dedicated to them than others. For instance Alexander the Great, Julius Caesar and Plato will often have biographies that run for several pages. A lot of space is also dedicated to language, literature and science.
The only fault I find with the book is that the Late Antique period is not given as much attention as Classical Greece and Rome. I tried to find information on the Scholae Palatina but I couldn't find an entry. Oddly, the Comitatenses do get an entry though, but the Scholae aren't mentioned under that section.
The newest version of the book now comes with a list of new entries, a guide to the area advisors and an index to the intials of the contributors.
At 1,640 pages long, this a very large and heavy tome. The entries are written in very small print, so it could be a strain on your eyes if you have bad eye-sight. No illustrations or photographs are provided in the book.
Overall, if you are serious about the Classical World, you will find this book an absolute treasure. It might be expensive but I think it is worth every penny. Highly Recommended!