Area 51 warning sign

Fact 1: Sign directly retrieved from the gates of Area 51, a place with approximately 1552 square kilometers.

Fact 2: Area 51 was created during the Cold War between the USA and Soviet Union as a testing and development site for aircrafts, including recon airplanes such as U-2 and SR-71 Blackbird, but there are speculations about test with alien beings

Fact 3: