- Places on earth advised not to visit, 4-

Places on earth advised not to visit, 4-

The existence of Area 51 was not recognized from the United States government until 1992 when in 2013 documents the name of the Nevada military base was mentioned.

Officials have not yet revealed what kind of research is going on in this area, although proponents of the conspiracy theory claim there has been a study of strange activity there.

The vast desert prevents any infiltration, and the area is highly guarded, and even visitors who have security clearances enter Area 51 on board private aircraft, and this method is one of many methods that keep Area 51 highly secret.