On Aug. 21, 2015, the world watches in stunned silence as the media reports a thwarted terrorist attack on a train that's bound for Paris -- an attempt prevented by three young Americans traveling together through Europe. The heroic and courageous actions of Anthony Sadler, Alek Skarlatos and Spencer Stone help to save the lives of more than 500 passengers on board.

After the elevators at a New York City skyscraper begin inexplicably malfunctioning, putting its passengers at risk, mechanic Mark Newman and reporter Jennifer Evans begin separate investigations. Newman gets resistance from superiors at his company, which manufactured the elevator, while additional elevator incidents cause several gruesome deaths. The police get involved and suspect that terrorists are responsible, but a far stranger explanation looms.

In honour of the 15th Anniversary of 9/11, National Geographic Channel is looking back at the very best reporting we have done since this world-changing tragedy first happened using extended excerpts from past specials that relate directly to events leading up to and following the attacks on New York City and Washington DC.

Badal is a victim of the 1984 riots, brought up by a terrorist. Badal aims to kill the treacherous police officer who had killed his parents and his loving sister. He takes shelter in the house of an honest police officer and falls in love with a minister's granddaughter. Will he be able to accomplish his revenge?

Journalist Amar falls for a mysterious woman on an assignment, but she does not reciprocate his feelings. However, when Amar is about to get married, the woman shows up at his doorstep asking for help.

An aimless, jobless, irresponsible grown man joins the army and matures into a battlefield hero.

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When Chechen rebels take over a Russian nuclear reactor, it’s up to a special ops marksman to rescue the hostages and prevent nuclear catastrophe.

When German police viciously quell a protest against the shah of Iran, popular journalist Ulrike Meinhof rebels against her dishonest marriage, walks away from her children and joins radical anarchist Andreas Baader. Together with Baader's girlfriend, Gudrun Ensslin, they form the violent Red Faction Army, and together perpetrate a slew of terrorist attacks as a way of disrupting the fabric of what they see as an increasingly fascist state.

When a train carrying atomic warheads mysteriously crashes in the former Soviet Union, a nuclear specialist discovers the accident is really part of a plot to cover up the theft of the weapons. Assigned to help her recover the missing bombs is a crack Special Forces Colonel.

Called in to recover evidence in the aftermath of a horrific explosion on a New Orleans ferry, Federal agent Doug Carlin gets pulled away from the scene and taken to a top-secret government lab that uses a time-shifting surveillance device to help prevent crime.

Salma Zidane, a widow, lives simply from her grove of lemon trees in the West Bank's occupied territory. The Israeli defence minister and his wife move next door, forcing the Secret Service to order the trees' removal for security. The stoic Salma seeks assistance from the Palestinian Authority, Israeli army, and a young attorney, Ziad Daud, who takes the case. In this allegory, does David stand a chance against Goliath?