FRONTLINE and the Associated Press trace Russian President Vladimir Putin’s pattern of atrocities in Ukraine and across other conflicts, exposing the challenges of trying to hold Russia to account. The documentary offers a window into the lives of Ukrainians living under siege, capturing the devastation of the war and the ongoing pursuit for accountability.

Discover one of the most significant British archaeological finds of the century in the Althorp Estate, house to the late Diana, Princess of Wales. What treasures and history will this extensive excavation reveal?

A nationally recognized K9 Unit Officer, Isaac Ho‘opi‘i is responsible for saving numerous people from the Pentagon during the terrorist attacks on September 11, 2001. CORRIDOR FOUR illustrates Isaac’s story in the aftermath, a story not of a hero basking in the glory of his past deeds but of a human being filled with regret that he couldn’t change something completely out of his control.

This four-part series brings to life one of the most indelible figures of the 20th century. A three-time heavyweight boxing champion, Ali captivated millions of fans across the world with his mesmerizing mix of speed, grace and power in the ring, and charm and playful boasting outside of it.

This two-part series examines the legacy of the Confederate battle flag and its impact on the people, politics and perceptions of the Southern United States. Through interviews and historical footage, it traces the symbol’s controversial relationship with the South and how an unspeakable tragedy served as the catalyst for its long-debated removal.

Hidden in the Genes: Henry Louis Gates, Jr. helps Rebecca Hall and Lee Daniels solve family mysteries through DNA detective work, illuminating both history and their own identities.

The October Revolution of 1917 has gone down in history as the only Russian Revolution that really mattered. But Lucy Worsley reveals that the earlier revolution was downplayed and in fact that it was the truly spontaneous popular uprising that swept the Czar from power.

9/11 Kids catches up with the 16 schoolchildren who were with President Bush on September 11.

Lucy Worsley reveals how mental health problems forced King George III to relinquish power to his debauched and extravagant son. Was this really an era of elegance and regal splendor or an age of radicalism and revolution? How were myths and secrets used to save the British monarchy?

Ernie Pyle: Life in the Trenches tells the story of WWII correspondent Pyle, a Pulitzer Prize-winning columnist who reached millions each week with tales celebrating “ordinary” Americans doing extraordinary things.