The film takes you on a journey inside the Vatican like you've never seen it before. From the ancient "City of the Dead" beneath St. Peter's basilica to the vaults of the Secret Archives, to the Pope's private offices and TV room. The show also explores the long and tumultuous relationship between the Vatican and the U.S., uncovering documents that date back to the Civil War and exploring Reagan's relationship with John Paul II in their quest to combat the Soviets during the Cold War.

What if an extra-terrestrial force attacked Earth? What might that look like and how will the people of Earth respond? Consulting a cast of world-renowned scientists, survival experts and defense experts, National Geographic explores this frightening scenario. Experts reveal what could motivate alien invaders to attack Earth, and speculate on how the attack might play out, the strategy alien invaders might use, and the most effective ways for humans to respond.

Examining theories about the discovery of America long before Christopher Columbus' 1492 voyage by explorers from such places as China, Japan, Wales and Ireland.

Documentary on the main principles of Sun Tsu "Art of War" illustrated with examples from the second world war, the Vietnam war and the American civil war.

In 1898, a Minnesota farmer clearing trees from his field uprooted a large stone covered with mysterious runes that tell a story of land acquisition and murder. The stone allegedly dates back to 1362. Initially thought to be a hoax, new evidence suggests the find could be real, and a clue that the Knights Templar discovered America 100 years before Columbus, perhaps bringing with them history's greatest treasure... the Holy Grail. Follow the clues as experts use erosion studies on the rune stone and match symbols in Templar ruins all over Europe to support this theory. Stones with similar markings have been found on islands across the Atlantic Ocean, and in Massachusetts and Rhode Island. Is it possible the Knights Templar, long thought to have been massacred, escaped on an incredible journey and were leaving clues to the whereabouts of the stone?

10,000 B.C. was a time of cataclysmic change on Earth. Extreme climactic fluctuations hurled the planet into a minor ice age; megafauna like the saber-toothed tiger and woolly mammoth were suddenly becoming extinct; and early humans began to inhabit North America. Cold and hungry, their fragile communities undertook perilous hunting expeditions. The slaughter of a single mammoth, weighing nearly ten tons, could be the difference between survival and death. Journey to 10,000 BC. brings this unique and thrilling period to life, and investigates the geologic and climate changes that scientists are just beginning to understand. In a major forensic investigation, History visits early human archaeological sites to uncover fossilized bones, ancient dwellings, and stone weapons, and uses state-of-the-art CGI to recreate the treacherous mammoth hunts and the devastating impact of a comet colliding with Earth.