Experts explore the tangled web of stories surrounding the Grail in search of clues to its existence and purported powers. Trace the incredible history and extraordinary tales of power and superstition, magic and mystery that surround one of Christianity's most sought-after relics.

WWI introduced game-changing weapons of mass destruction: armored tanks, chemical weapons, submarines, and the aerial bombardments of cities. Using experts, eyewitness testimony, and riveting archival re-creations, explores the deadly mix of weapons that defined modern warfare and shocked the world. See how these weapons were developed and witness the devastation they left behind.

From tidal waves to storm surges to underwater volcanoes, the staggering power of the world's oceans has proved a destructive force for humankind throughout time. Track the history and evolution of the seven deadliest underwater zones on the planet at locations that have been the setting for events such as floods, tsunamis, hurricanes, and whirlpools, to name a few. Discover how people today have learned to avoid some of these catastrophes, and much...

"One of the most reviled monarchs of all time, Marie Antoinette became empress of France at the age of 19. She offended the nobility with her disregard for court etiquette, and the citizens with her incredible extravagance and absolute disregard of their situation. By August of 1792 the people had rebelled and Marie and King Louis XVI were imprisoned. Within months they were beheaded"--Container.

Their name is synonymous with the American circus. But long before there were dramatic acrobatics, exotic animals, and special effects, the Ringling Brothers circus consisted of an all-Ringling cast of two dancers, two musicians, and one singer. The Wisconsin-born Ringling brothers grew up in an era when the circus's arrival in town triggered an unofficial holiday. Five of the seven brothers, Albert, Otto, Alfred, Charles, and John, were drawn to...

Presenting the life and legend of Pat Tillman from his eary childhood in Freemont, California, to his days of glory on the football field, to his tragic and controversial death in Afghanistan.

The story behind Sergey Brin and Larry Page, who met at Stanford University's PhD computer science program. Together the men started up Google, the world's top search engine using their own credit cards, and a little help from a savvy investor.

This History Channel miniseries takes viewers on a state-by-state tour of the United States that reveals "the very best" of each state, providing information about what is special and unique throughout the country.