Joel Levy's "Lost Histories" is an interesting survey of a whole range of ancient and historical mysteries. The mysteries involve people or treasures or cities that went missing, but Levy is pretty skeptical in his approach. If you buy the book expecting that the mysteries will be solved by appeals to supernatural or extraterrestrial forces, you'll be disappointed. On the other hand, if you are looking for a book that nicely recaps the mysteries and summarizes modern thinking about them (as I was), you'll really enjoy "Lost Histories".
Levy covers many topics in fairly short chapters--some of the stories will be familiar to those who enjoy tales of historical mysteries, but others (like the lost army of Cambyses, the lost Persian Fleet, the fate of King John's crown jewels and the tragic loss of the White Ship) seem fresh, at least to me. The book is divided into several sections, each of which includes several chapters. The section on "Lost Places" discusses Atlantis, The Temple of Solomon, The Library at Alexandria, Camelot and El Dorado; the section on "Lost Artefacts, Works and Relics" covers the Ark of the Covenant, the lost dialogues of Artistole, the Holy Grail (whatever it was), and Shakepeare's "lost" plays; "Lost Treasures" deals with the Dead Sea scrolls, King John's jewels, treasures of the Knights Templar, Monztezuma's treasure, the buried pirate treasure of Captain Kidd, and the Oak Island Money Pit; "Lost People" explores the lost Persian army of Cambyses (swallowed up by the Egyptian desert), the location of Boudicca's grave, The Lost Colony of Roanoke, and, of course, the disappearance of Amelia Earhart; finally, the section on "Lost Wrecks" seeks the location of the Persian invasion fleets lost during the wars with Greece, the White Ship, Spanish treasure galleons and Lord Franklin's ill fated expedition to find the Northwest Passage.
I found Levy's book to be quite readable, although the number of topics covered means that he doesn't get into any of them in great detail. Each chapter comes with a list of references, which will help the reader who wants to dive more deeply into the topics that Levy surveys.
All in all, this is a fun, entertaining little book, and one of the better expositions of historical mysteries that I've encountered. Based on my experience with this volume, I ordered up Levy's "Secret History" and "The Doomsday Book" and look forward to some more enjoyable reading. (For other good books in this genre, see my book lists for "History's Mysteries" and "Ancient Mysteries".)