“Secrets of the Vatican,” a special, 90-minute FRONTLINE presentation premiering Feb. 25, tells the epic, inside story of the collapse of the Benedict Papacy—and illuminates the extraordinary challenges facing Pope Francis as he tries to reform the powerful Vatican bureaucracy, root out corruption, and chart a new course for the troubled Catholic Church and its 1.2 billion followers.

FRONTLINE explores how the perennial teen quest for identity and connection has migrated to social media - and how big brands are increasingly co-opting young consumers' digital presences.

Tyler Oakley talks with FRONTLINE about sharing his “most adventurous life” with his fans on YouTube. He explains how he got started and when video-blogging became a career.

Tyler Oakley talks with FRONTLINE about what he hopes to do next and the possibilities for success after YouTube. “We are all breaking ground in our own little ways.”

Tyler Oakley talks with FRONTLINE about the joys of doing what he loves online: “At the end of the day, I’m a 12-year-old girl.”

How do companies figure out what’s cool? Today, teens tell them, through their “likes” and posts on social media networks.

Tyler Oakley tells FRONTLINE about the new “autograph,” and what’s different — and better — about online fame today.

Tyler Oakley tells FRONTLINE about working with brands on his own terms, and maintaining creative control of his YouTube channel.

A startling portrait of everyday life in a war zone, through the eyes of children.

Three years into Syria's civil war, rebel forces aren't just fighting the Assad regime. They're also vying for control against factions aligned with Al Qaeda. FRONTLINE correspondent Muhammad Ali -- a Syrian native himself, delivers a gripping report from inside a country in turmoil.

Three years in to Syria’s civil war, rebel forces aren’t just fighting the Assad regime. They’re also vying for control against factions aligned with Al Qaeda. FRONTLINE correspondent Muhammad Ali—a Syrian native himself, and one of only a few reporters to make it safely into, and then out of, Syria’s northern front in recent months—delivers a gripping report from inside a country in turmoil.

In this undercover footage, North Korean soldiers are forced to build a railroad honoring Kim Jong-un — but privately question the new leader. This clip is an excerpt from FRONTLINE's “Secret State of North Korea,” which premieres Tuesday, January 14.

Just two years in the job and armed with nuclear weapons, North Korea’s Kim Jong-Un is the world’s youngest dictator, ruling one of the world’s most isolated countries with an iron fist. Drawing on undercover footage from inside the country and interviews with recent defectors, FRONTLINE shines light on the hidden world of the North Korean people.

A former classmate of Kim Jong-un recalls their days together at a Swiss public school. Speaking on the condition of anonymity, the classmate says that Kim Jong-un posed as the son of a diplomat, not the North Korean leader.

Kenji Fujimoto was hired by Kim Jong-il to prepare sushi for the North Korean leader and his entourage. He became close to the family, and soon was assigned to entertain the young Kim Jong-un, with Japanese toys and games of basketball.

Jeong Kwang-il, a former political prisoner in North Korea, now smuggles Western entertainment back into the country he fled.

Undercover footage smuggled out of the country shows North Korean women defying the rules and regulations of Kim Jong-un’s regime. This clip is an excerpt from FRONTLINE's “Secret State of North Korea,” which premieres Tuesday, January 14.

FRONTLINE correspondent Martin Smith goes inside the dramatic hunt that uncovered the biggest insider trading scandal in U.S. history, drawing on exclusively-obtained video of hedge fund titan Steven A. Cohen, incriminating FBI wiretaps, and interviews with both Wall Street and Justice Department insiders.