Unlock the secrets of the most mysterious structures on earth... Towering, majestic and timeless, the great pyramids of Egypt have fascinated explorers and engineers for thousands of years. But despite centuries of research and study, the mighty pyramids have yielded few of their tantalizing secrets. How did ancient architects and laborers design and build these magnificent monuments, which are among man's most impressive accomplishments? Were they constructed to transport royalty to the afterworld-or as altars of bloody human sacrifice? And what explains similar pyramids found thousands of miles away in Central America and Asia? Search for answers on this unforgettable journey inside the greatest wonders of antiquity.