Throughout the 20th century, the world has seen countless stories related to UFOs. Incidents like the Battle of Los Angeles (1942), Roswell (1947), and Rendlesham Forest (1980) remain unsolved. Now, we take a closer look at the details behind these stories. From the ancient civilizations of ...

Ancient underwater cities can be found around the globe, but could these aquatic worlds be the ruins of unknown civilizations--or even proof of extraterrestrial visitations? See more in Season 2, Episode 4, "Aliens Above and Below." Stay up to date on all of your favorite The HISTORY Channel ...

Ancient astronaut theorists uncover Mesopotamian inscriptions that provide evidence of the Anunnaki existence thousands of years ago. See more in this clip from "Aliens and Lost Civilizations." Stay up to date on all of your favorite The HISTORY Channel shows at http://history.com/schedule. ...

Ancient Greeks, Egyptians and other cultures have legends about exceptional children who are the offspring of humans and the gods. See more in Season 2, Episode 24, "Alien Influences." Stay up to date on all of your favorite The HISTORY Channel shows at http://history.com/schedule. ...