Secrets of Ancient Structures - Season 1, Episode 01: Battling Giants

Throughout history, the colossal monuments of our ancestors have embodied their determination to leave a lasting mark on the world. The Colosseum - its spectacular engineering and design that once hosted violent spectacles for thousands - holds deep secrets of Roman ingenuity. The serpentine expanse of the Great Wall of China, winding over 21,000 kilometers, conceals clues of its construction - surprising ingredients that not only fortify its strength but reflect the resourcefulness of the builders charged with protecting an empire. Malbork Castle, the largest brick fortress in the world, showcases the military prowess of the Teutonic Knights. Its strategic design and defensive features hold untold stories of battles fought and won.