In 1692, the townspeople of Salem, Massachusetts found themselves in a panic over witchcraft. But after several months, the paranoia and violence ended almost as quickly as it began. All witch trials were halted, publications about the terror were officially banned, and the location of the execution site vanished from any records. Today, a group of historians uncovers new information about the infamous witch hunt in an effort to answer its most enduring mysteries. They use 3D computer mappings techniques and ground-penetrating radar to rediscover the long-lost site of the witch hangings.

The Spanish flu was one of the most devastating natural disasters in history, an unstoppable virus that swept the planet in 1918, killing as many as 50 million 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 and see if could happen again.