What do we know about the mysterious Area 51?

One of the greatest unanswered questions of our lives is: do aliens exist? In the United States, one military base is the subject of more conspiracy theories than anywhere else: Area 51. This is because, for decades, its existence was kept secret. The secrecy, as well as other strange events, has led many people to believe there is alien activity in the area. True or false? Take a look at the gallery and decide for yourself!