National Geographic On Demand

National Geographic on Demand is the home for the best animals, nature, history, science, engineering, people, and places content.

We celebrate the far-reaching achievements of Stephen Hawking and explore his determination to unlock the mysteries of time.From scientific breakthroughs, escapes and disasters, discover the untold stories of the Apollo space missions, where 24 men risked their lives.A look back at the infamous London City jail, and its terrifying history.The site of Hitler's bunker, long one of Berlin's best-kept secrets.Conservationists seek new ways to track and record rare species of fish, such as the dogfish tuna, without harming their chances of survival.These are no ordinary fish. These are megafish, monsters that defy belief with their enormous proportions, predatory weapons and elusive nature. Over 6-foot in length and weighing over 16-stone these fish are no easy catch.Hooked dives into dangerous waters to find the biggest monster fish.