The What Do We Know About? series explores the mysterious, the unknown, and the unexplained. Will we ever learn the truth about what actually landed at Roswell?

From the #1 New York Times Best-Selling Who Was? series comes Where Is?, a series that tells the stories of world-famous landmarks and natural wonders and features a fold-out map!

In 1947, an unusual object crashed in the New Mexico desert and was recovered by the Roswell Army Airfield officers. People everywhere began to speculate what the object could be. Could it possibly be a flying saucer? Would that be proof of aliens and life beyond Earth? Even decades later, some people still believe that the Roswell Incident is the most famous UFO sighting ever. Still, those who worked at the airfield insist it was just a weather balloon that had fallen from the sky. Was the Roswell Incident evidence of alien life, a government cover-up, or just a myth? Here are the facts about what we do know about Roswell.