Room 39
One place that’s even more secretive than U.S. military is North Korea. There’s a building called Room 39, it’s basically Area 51 but for Korea’s military. But they can be even more secretive than any other country.
People who have defected from the country have made bold claims. Stating that the building is used for anything from counterfeiting to drug production. The building allegedly makes half a billion to 2 billion dollars!