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Follows the uniquely qualified team of special agents that are responsible for investigating crimes that occur in the National Park System, as they tackle cases and bring law and order to this public land.

Follows the lives of two volunteer nurses on opposing sides of the Civil War - New England abolitionist Mary Phinney and Confederate supporter Emma Green.

Resistance: They Fought Back tells the largely unknown and incredibly courageous story of Jewish resistance during the Holocaust.

An elite team is investigating the Bermuda Triangle with the aid of a secret weapon -- a map, decades in the making, marking the location of unidentified undersea wrecks and anomalies.

Modern historians, equipped with state-of-the-art technology and newly discovered evidence, rewrite the nation's most iconic stories.

Psychological criminologist and ex-FBI special agent Dr. Bryanna Fox and her class of graduate students study convicted murderers; they evaluate their personality traits and develop psychological profiles.

In July 1945, a Japanese submarine sinks the USS Indianapolis. Indianapolis' final resting place remains a mystery for more than seven decades, until an expedition launched by philanthropist Paul G. Allen discovers the ship in August 2017.

A documentary feature focusing on the national crisis of behaviorally challenged kids and the effects of their behavior on families, the school system, and the legal system.

The expedition team of citizen-historians and divers in their search for the warship in a challenging underwater terrain.

During a failed raid to free northern POWs in 1864, papers are found on the body of Union Colonel Ulric Dahlgren ordering the assassination of Confederate President Jefferson Davis. The discovery fuels outrage in the South and energizes the Confederate secret service. Now, historians have teamed up with descendants of the slain colonel to uncover who was behind the audacious murder plot and to consider if Abraham Lincoln's assassination one year later may have been a retaliatory measure.

The Spanish flu was one of the most devastating natural disasters in history, an unstoppable virus that swept the planet in 1918, killing tens of millions of people. New evidence suggests the possible birthplace was actually in America's heartland. Witness a globe-spanning story of death and denial on an epic scale, as we visit a mass gravesite, pore over old medical records and diaries, and use cutting edge scientific research to reveal the horrific truth behind this deadly pandemic.

On the morning of December 7, 1941, Japan's war machine attacked Pearl Harbor, killing over 2,300 American servicemen. The conventional story is that America was caught sleeping that day and was hit without warning. But newly declassified documents from U.S. Naval intelligence and the FBI reveal a very different tale, one of Japanese and German spies studying Pearl Harbor long before the assault with our agents watching them the whole time. So, how were we still caught so tragically off guard? Modern historians are determined to find out.

It's a Cold War story involving a turncoat KGB agent, doctored computer chips, and a fiery blast in the Siberian wilderness big enough to see from space. Modern historians investigate the claim of a June 1982 explosion of a Russian gas pipeline to see if it was the result of the world's first-ever cyber attack, a retaliatory measure secretly ordered by Ronald Reagan to bring the Soviet Union to its knees.

Casimir Pulaski was an American Revolutionary War hero who helped save George Washington's life in the Battle of Brandywine. He was known as the "Father of the American Cavalry," but new evidence suggests that the general may not have been male. Follow a team of anthropologists as they examine the bones found at Pulaski's monument in Savannah and run state-of-the-art DNA tests in order to determine if the officer was female or if someone else was buried in the tomb.

Benedict Arnold was a hero of the revolution. He was one of Washington's best generals. He had a new bride said to be the most beautiful woman in the colonies. And yet, just one month after marrying 18-year-old Peggy Shippen, Arnold reached out to the British and began to plot treason. What drove the celebrated general to betray his country? Investigators are now exposing a vast conspiracy to crush America's hopes for independence with Benedict Arnold's young wife at the center.

After discovering the bow of what is thought to be the long lost Eagle 56, an unlikely team of citizen-detectives discovers the mangled stern section they have been searching for. Finally, the team is able to confirm that this wreck is the Eagle 56: a US warship sunk within sight of American shores during WWII. Lost for 75 years, the remarkable discovery of the wreckage marks the end of one mystery and the beginning of an even larger one: what really sunk this ship?

An unlikely team of citizen-historians and divers has found two pieces of the Eagle 56: a US warship sunk within sight of American shores during WWII. But the critical piece, the boilers, still remain missing. With time running out, can they solve the mystery of what really happened to this ship?

An unlikely team of citizen-detectives discovers the mangled bow of the Eagle 56: a US warship sunk within sight of American shores during WWII. Lost for 75 years, the remarkable discovery of the wreckage marks the end of one mystery and the beginning of an even larger one: what really happened to this ship?

As Special Agent Shott investigates the suspicious death of Harold's wife Toni, anonymous letters and phone calls lead authorities to reopen an investigation into the death of Harold's first wife 17 years earlier.

As the investigation into the suspicious death of Toni continues, Special Agent Shott learns something startling about Harold's unusual relationship with his sister-in-law.

A search of the Henthorn home leads investigators to expose one of Harold's biggest secrets. Shott and Grusing, her FBI partner, are confident that Harold murdered Toni.

Harold Henthorn calls 911 to report that his wife Toni has been gravely injured after falling off of a cliff on a remote trail.

Journalist Tony Harris travels to the Florida coast to investigate some of the strange underwater anomalies discovered at the Bermuda Triangle. Tony and a team of experts analyze evidence of similar discoveries from around the globe and pass a verdict.

Tony Harris travels to the Florida coast to investigate strange weather patterns and unexplained phenomena at the Bermuda Triangle. Tony and a team of experts will analyze evidence of similar anomalies from around the world and pass a verdict.

Journalist Tony Harris travels to the Florida coast, a hot spot for UFO sightings. Tony and a team of experts will analyze compelling evidence of unidentified aerial phenomena at the Bermuda Triangle and around the world and pass a verdict.