When Russia's last tsar, Nicholas II, and his family disappeared 90 years ago, eyewitness accounts said the family was brutally murdered. What really happened to them? AKA: Romanovs: The Missing Bodies (UK)

Old-world traditions of the Mafia clash with the new ways of biker gangs when the two groups join forces to take control of Montreal's drug trade. Crime reporters, undercover cops and former mafia members shed light on the underbelly of this crime world

For gang members in South Central Los Angeles, the "hood" is a brutal war zone, where streets and reputations are vehemently defended, often to the death. NGC goes into this violent world for four months -- a period in which more than 60 L.A. residents are killed or wounded in gang shootings. Watch an emotional funeral, see 11-year-olds brandishing their weapons, and hear the stories of those entangled in this chilling cycle of bloodshed.

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See how this Islamic terrorist network continues to morph, selects and trains militants to blend into Western society, and inspires a global jihadist movement. Meet men who know and have fought with Osama bin Laden and find out why he's still at large

Top bounty hunters Leonard Padilla and Rob Dick must overcome unusual challenges when a fugitive's friend creates a diversion and a confrontational man threatens them at the door of a bust.

Leonard Padilla, the "godfather of bail," and his partner and former competition Rob Dick work to track down a list of skips in California. As pressure mounts, Rob must go to Oklahoma to find who he needs.

A pair of expert bounty hunters travel to Guam to find an elusive fugitive and then navigate through a maze of lies that lead to a dead end in Hawaii.

In the 1980s, Miami was a playground for the rich and famous. But behind the fun in the sun, an underground cocaine war was escalating. South American drug cartels would forever change the face of sunny Miami.

Brad Pitt may have made it famous, but NGC shows you what life is really like in the subculture of competitive fighting. No judges, no trophies and no referees. It's not just a sport but a rite of passage, a personal challenge each man must face.

Michael Travesser claims he is the Messiah, and the members of the Strong City cult believe him. NGC goes inside the Strong City cult in New Mexico to get an extended look at the lives of its 56 members.

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In Boston, James Whitey Bulger fights his way to the top of the citys rackets in a barrage of bullets and blood. Whitey has friends in high places. His brother Billy runs the State Senate. The FBI recruits him as an informant. Trading on his connections, Whitey avoids indictment. But as the bodies pile up, Bulger draws the FBI, local officials and Bostons Irish community into a web of corruption, double cross and murder that rocks Boston to its core. Interviews include Bulgers enforcer Kevin Weeks; Bulger gangland rival Pat Nee; former Irish mob leader Howie Winter; former deputy chief of the FBI's Boston office Robert Fitzpatrick; and former Massachusetts State Police Officer Tom Foley.

How and why did a man so rich, so accomplished and so visible become so reclusive, phobic and fragile? Recent medical discoveries may explain the bizarre billionaire.

When London turns hip in the Swinging 60s, a new type of villain takes center stage: the English Mobster. Murderous twins Ron and Reg Kray square off against their South London rivals; the Richardsons. When they are finally jailed, gangland plunges into chaos as gangsters turn informant. Filling in the vacuum, a younger generation begins muscling in during the early 80s, and cockney villains regroup to plan the worlds biggest armed robberies. Interviews include ex-Richardson gang enforcer Mad Frankie Fraser; former armed robber and Kray associate Freddie Foreman; ex-armed robber Bernie Khan; and Metropolitan Police veteran Tony Lundy - supergrass informant handler.

Shadow Works: Road Crews follows a tight-knit group of construction workers who repair damaged urban roadways and bridges all over Massachusetts. Culled from the best in their field, this team works overnight to complete road repairs before the morning commute begins. From weathering intense physical challenges to watching for speeding vehicles to dealing with the strain that working at night has on their families, the stories of these men exemplify the effort and dedication of this often invisible occupation.

High school has always been tough, but for the students at Walter L. Cohen High School in New Orleans, it's a struggle for survival. In a city with one of the highest homicide rates in the country, day to day life at Cohen isn't easy. NGC roams the halls with students as they tell their unvarnished accounts of high school life.

Rare access to a highly classified division of the Defense Department reveals the latest generation of defense technologies, including unmanned aerial vehicles and hypersonic aircraft.

Go behind the 'no entry' sign at Miami airport to witness how officials handle the safety and security of nearly 100,000 passengers on a typical day.

Uncover the strategy and details behind Operación Jaque – the masterwork in a series of Colombian intelligence endeavours and military operations aimed at suppressing powerful guerrilla militia, the Revolutionary Armed Forces of Colombia (FARC). Through a series of ploys, Colombian officials tricked FARC leaders into releasing 15 politically significant hostages, including Colombian presidential-hopeful Ingrid Betancourt. Approximately 700 FARC hostages are still being held. Testimonies from high-tier military leaders, the intelligence agents who developed the operation, helicopter hostage rescuers, hostages and captured FARC members unravel this web of espionage. While Colombia's President and Defence Minister received accolades from around the world following the liberation, the hostage rescue has not been without controversy.

Youth can be a minefield: drugs, sex, violence, and peer pressure. One group has an extreme way of dealing with it. They call themselves Straight Edge, and while they are being classified as a violent gang in areas such as Salt Lake City and Reno, they aren't like any other gang you know: they reject drugs, drinking, smoking, and even casual sex. They're rebels against a society in which everything goes. National Geographic goes inside this growing youth movement caught between being a refuge for Americas kids and a dangerous gang wanted by authorities.

From secret codes on the Internet to violent lyrics in head-banger metal music, this burgeoning white power movement is finding new ways to spread its message of racial pride and separation.

How did Ted Kaczynski, brilliant mathematician, political activist and master criminal, elude investigators for 17 years? NGC reveals surprising truths about this unconventional killer.

After the godfather of the Philadelphia mob was assassinated, wise guys battled for the top position -- and the Mafia's code of silence began to crumble. Mafia soldier Nick 'The Crow' Caramandi and hit man Ron Previte describe gangster life in transition.

At the height of the Cold War, the CIA launched a highly classified, top secret research program that exposed Americans to biological agents, hallucinogenic drugs and psychological techniques aimed at mastering the art of mind control. Entire cities in America were contaminated with bacteria, exposing millions to germ warfare. NGC's CIA Secret Experiments examines what happened, shedding light on its research to better understand the extent and full reach of its disturbing experiments.