Area 51 is a military base in the middle of Nevada. It has acres and acres of protected land that surrounds the base so that no one can get near it. People theorize that the government is holding alien technology and even alien lifeforms at the base. The government never even acknowledged it until 2019.
The Mattress Firm Conspiracy
Have you ever noticed that there is an abundance of Mattress Firms? Sometimes, they're even across the street from one another! This made people believe that the corporate entity was in some sort of underground ring of crime...