It’s a multi-million-dollar secret kept under wraps every year. Six undisclosed locations, 18 bikini-clad models and 155,000 images to choose from. But when the 2010 Sports Illustrated Swimsuit Issue is finally revealed, it will be a global sensation like no other.CNBC’s Sports Business Reporter Darren Rovell takes an unprecedented look inside the most profitable single-issue magazine franchise in the world. Find out how business, beauty, fashion and sports come together to create this much-anticipated, multi-dimensional franchise that alone generated 7 percent of Sports Illustrated's advertising revenue in 2009.

Alice Roberts embarks on a quest to discover what lies behind the passion for wild swimming, now becoming popular in Britain. She follows in the wake of Waterlog, the classic swimming text by the late journalist and author, Roger Deakin. Her journey takes in cavernous plunge pools, languid rivers and unfathomable underground lakes, as well as a skinny dip in a moorland pool. Along the way Alice becomes aware that she is not alone on her watery journey.

Join Simon Cox, author of the international best-selling "Illuminating Angels & Demons," as he and eleven additional noted authorities take you on an in depth journey to uncover a plan for world domination that dates back to the early foundations of Christian history.

Norwegian journalist Paul Refsdal risked his life to become the first Westerner to film behind Taliban lines in Afghanistan, and see the war between the allied forces and the insurgency from the Taliban’s viewpoint.

Seized and burned by Alexander the Great's conquering army, shaken by uncounted earthquakes, eroded by 25 centuries of rain, fluctuating temperatures and scouring winds, Persepolis, the greatest of the royal residences of ancient Persia is a definitive ancient ruin.

National Geographic presents a portrait of one of America’s most sacred places. Once little more than a potter’s field, Arlington National Cemetery has become a national shrine and treasury of American history. Now, discover how this revered site came to be, and how it serves as the final resting place for both the famous and obscure, from John F. Kennedy to the Unknown Soldier. Through rare archival footage and captivating, true-life accounts, experience the moving stories of heroes and heroines and witness the daily activities and official rituals of the dedicated staff who strive to honor those who are laid to rest here. From fallen soldiers and daring explorers to political leaders and other honored Americans, the hallowed history of Arlington reveals a powerful portrait of this iconic and venerated landmark.

Los Angeles, California has one of the largest and most sophisticated sewer systems in the world. Every day the amount of raw sewage that flows into the treatment facility could fill 780 Olympic-sized pools. But its old pipes are deteriorating and the system is in constant danger of breaking down. This documentary follows the path of human waste through the pipes and tunnels of the L.A. sewer system to its final destination at the treatment plant. Spend the day with members of L.A.∙s Public Works Department as their job takes them deep into the sewer system, where the slightest breakdown could have catastrophic biohazard consequences.