The third volume of “Secrets of Millennia” includes scientific and artistic essays, grouped into three sections. The first, “Lost in Seas and Ages,” is dedicated to the search for sunken ships and their treasures. The second, “To Unknown Lands,” tells how today’s researchers reconstruct the routes of ancient and medieval travelers, as well as those who traveled unknown roads in the last century. The third tells about underground treasures left by adventurers, pirates, kings and other financially secure people. The book is intended for everyone who is interested in history and its unsolved mysteries, that is, for the widest range of readers.