Secret bases are hidden locations used for military, research, or other confidential purposes. These facilities are often designed to be discreet and may be located underground, in remote areas, or disguised as ordinary buildings. They can serve various functions, such as testing new technologies, conducting experiments, or housing sensitive information. Many countries maintain secret bases to protect national security and conduct operations without public knowledge. Some well-known examples include Area 51 in the United States, which is often associated with UFO sightings and advanced aircraft testing, and Cheyenne Mountain Complex, a military installation designed to withstand nuclear attacks.