Describes methods used by early irrigators, architects, and military engineers to build and maintain structures to serve their ruler's wants.

Rarely do books have such a great influence on a genre as Lest Darkness Fall has had on science fiction. Frequently quoted as one of the 'favorite' books of many of the masters of the field, this book by L. Sprague de Camp helped establish time-travel as a solid sub-genre of science fiction. ** An indication of the influence and longevity of the book is by the number of best-selling writers who have written stories in direct response to, or influenced by, Lest Darkness Fall. This new volume also includes three such stories by Frederik Pohl, David Drake and S. M. Stirling written over a period of forty-three years-a testament to the timelessness of the book. ** Similar, thematically, to Mark Twain's A Connecticut Yankee in King Arthur's Court, the book tells the tale of Martin Padway who, as he is walking around in modern Rome, is suddenly transported though time to 6th Century Rome. Once in ancient Rome, Padway (now Martinus Paduei Quastor) embarks on an ambitious project of single-handedly changing history. ** L. Sprague de Camp was a student of history (and the author of a number of popular works on the subject). In Lest Darkness Fall he combines his extensive knowledge of the workings of ancient Rome with his extraordinary imagination to create one of the best books of time travel ever written.

When Darkness Falls, the third book in The Obsidian Trilogy from Mercedes Lackey and James Mallory Despite a great working of Wild Magic and High Magic that struck at the heart of the Demon Queen's evil plots, Knight-Mage Kellen and his Elven allies are still seen as enemies by the human Mage Council. The Elves and their allies must find a way to shatter the Demons' hold on the human Mages, for without their High Magic, the forces of Light will be destroyed by the forces of Darkness. The Commander of the Armies of Light decides to turn an Elven mine into a refuge for those driven from their homes by the war. Kellen is put in command of the force of engineers and warriors who will fortify the mine and does not learn until it is nearly too late that the caverns are full of Shadowed Elves. Vestakia, the half-human, half-Demon healer, finds that she has begun to be able to read the mind of her Demon father, Crown Prince Zyperis. The Demon Queen, Savilla, is preparing a great sacrifice that will summon He Who Is back to the world and make her the ultimate ruler forever. When Wild Mage Idalia learns of Savilla's plans, she knows there is only one way to prevent the coming of He Who Is. A very different sort of sacrifice must be made. At the Publisher's request, this title is being sold without Digital Rights Management Software (DRM) applied.

The Mathematics of Magic was probably the greatest discovery of the ages - at least Professor Harold Shea thought so. With the proper equations, he could instantly transport himself back in time to all the wondrous lands of ancient legend. But slips in time were a hazard, and Shea's magic did not always work - at least, not quite as he expected . . . This omnibus volume of all of the Magical Misadventures of Harold Shea contains The Incomplete Enchanter, The Wall of Serpents and Castle of Iron

This classic work of science fiction is widely considered to be the ultimate time-travel novel. When Daniel Eakins inherits a time machine, he soon realizes that he has enormous power to shape the course of history. He can foil terrorists, prevent assassinations, or just make some fast money at the racetrack. And if he doesn't like the results of the change, he can simply go back in time and talk himself out of making it! But Dan soon finds that there are limits to his powers and forces beyond his control.

Bringing together nine biographies from Plutarch's Parallel Lives series, this edition examines the lives of major figures in Roman history, from Lucullus (118-57 BC), an aristocratic politician and conqueror of Eastern kingdoms, to Otho (32-69 AD), a reckless young noble who consorted with the tyrannical, debauched emperor Nero before briefly becoming a dignified and gracious emperor himself. Ian Scott-Kilvert's and Christopher Pelling's translations are accompanied by a new introduction, and also includes a separate introduction for each biography, comparative essays of the major figures, suggested further reading, notes and maps.

Hugo Award winner and bestselling author Harry Turtledove gathers top SF and fantasy authors to write stories in the same humorous vein which de Camp practically invented. Includes tales by Poul Anderson, Frederik Pohl, and David Drake. Original.

Wildly original, funny and moving, The First Fifteen Lives of Harry August is an extraordinary story of a life lived again and again from World Fantasy Award-winning author Claire North. Harry August is on his deathbed. Again. No matter what he does or the decisions he makes, when death comes, Harry always returns to where he began, a child with all the knowledge of a life he has already lived a dozen times before. Nothing ever changes. Until now. As Harry nears the end of his eleventh life, a little girl appears at his bedside. "I nearly missed you, Doctor August," she says. "I need to send a message." This is the story of what Harry does next, and what he did before, and how he tries to save a past he cannot change and a future he cannot allow.

From the New York Times–bestselling “standard-bearer for alternate history”: A spy takes on the enemies of the Byzantine Empire (USA Today). In another, very different timeline—one in which Mohammed embraced Christianity and Islam never came to be—the Byzantine Empire still flourishes in the fourteenth century, and wondrous technologies are emerging earlier than they did in our own. Having lost his family to the ravages of smallpox, Basil Argyros has decided to dedicate his life to Byzantium. A stalwart soldier and able secret agent, Basil serves his emperor courageously, going undercover to unearth Persia’s dastardly plots and disrupting the dark machinations of his beautiful archenemy, the Persian spy Mirrane, while defusing dire threats emerging from the Western realm of the Franco-Saxons. But the world Basil so staunchly defends is changing rapidly, and he must remain ever vigilant, for in this great game of empires, the player who controls the most advanced tools and weaponry—tools like gunpowder, printing, vaccines, and telescopes—must certainly emerge victorious. A collection of interlocking stories that showcase the courage, ingenuity, and breathtaking derring-do of superspy Basil Argyros, Agent of Byzantium presents the great Harry Turtledove at his alternate-world-building best. At once intricate, exciting, witty, and wildly inventive, this is a many-faceted gem from a master of the genre.

"Triumphant collection from SF's best-educated humanist.""-The Washington Post" A science fiction collection by one of the all-time greats of science fiction, L. Sprague de Camp. These stories and poems exemplify de Camp's unique outlook on life and mankind and are told with a quiet but sharp irony that became his trademark. Bold, inventive and humorous, this collection is a must for fans of the writer. "De Camp's clever fusion of the droll and the sober is evident throughout.""-Booklist"