These unlikely athletic events were once going for the gold but are now going down in history as forgotten games.

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R. Lee Ermey answers a question from Ken of Phoenix, Arizona, who wonders how the military is going to train the soldier of tomorrow. Ermey gives us a look inside the University of Southern Californias Institute of Creative Technology for the answer, which happens to be video games. Here, researchers are working on advanced simulators equipped with artificial intelligence; unlike tank or fighter jet trainers which focus on coordination, this next generation of simulators test decision-making abilities. The artificial characters will answer the trainees questions and respond to his or her commands. The military loves these simulators for if the trainees learn from their mistakes now, then maybe they wont make the same ones out in the field.

The Roman Coliseum was an engineering marvel designed to seat close to 75,000 people.

"What do Mickey Mantle, Hank Aaron, Ted Williams, Stan Musial, Willie Mays, and Yogi Berra all have in common They're all baseball players! And they all played together on the same field at the 1955 MLB All-Star Game at Milwaukee County Stadium. Watch the recap of this historic game from rare, HD footage."

HISTORY salutes the U.S. Army and U.S. Navy and their dedication to duty, honor, and valor.

Discover more about Mark Leech, one of the most famous soccer photographers in the world. He’s widely credited with having captured some of the sport’s most memorable moments. Watch as he displays the World Cup’s forgotten images.