Tria Thalman

Bill Pullman introduces and narrates this four-part documentary on the world's first national park, Yellowstone.

The tornado that struck El Reno, Oklahoma, on May 31, 2013, defined superlatives. It was the largest twister ever recorded on Earth.

"The World's Loneliest Elephant" Kaavan will finally experience freedom, thanks to his biggest champion, the one & only Cher. We'll follow Cher, Free The Wild, Four Paws International, and Kaavan on every step of the trip.

It's the height of the Cold War and the United States government is desperate to combat the spread of Communism. The CIA launches a highly classified, top secret research program into the covert use of biological and chemical agents. In simulated attacks on enemy populations, entire cities in America are contaminated with bacteria, exposing millions of Americans to germ warfare. But the real focus of the research is on mastering the art of mind control. Psychiatrists at top academic institutions work under secret contract with the agency. Psychiatric patients, prisoners, even unwitting members of the public are exposed to a startling array of experiments designed to facilitate interrogations, induce amnesia and program in new behavior. Every psychological technique is explored, including hypnosis, electroshock therapy and lethal cocktails of drugs. What was the extent of these brainwashing experiments? How did the CIA become involved in such far-reaching and disturbing research?

Wild animals kill people every day - but the most dangerous creatures aren't always what you think. From tigers to mosquitos, animals can kill in a multitude of ways.

America's Greatest Animals takes us across North America on a revelatory mission: which of the continent's landmark creatures deserve to make the list?

The grandest ocean liner ever built, its final resting place remained a mystery. Just how was the wreck's discovery linked to the Cold War's darkest days?