Vehicle Assembly Building
The Vehicle Assembly Building (originally the Vertical Assembly Building), or VAB, is a large building at NASA's Kennedy Space Center (KSC) in Florida, designed to assemble large pre-manufactured space vehicle components, such as the massive Saturn V, the Space Shuttle and the Space Launch System, and stack them vertically onto one of three mobile launcher platforms used by NASA. As of March 2022, the first Space Launch System (SLS) rocket was assembled inside in preparation for the Artemis I mission, launched on November 16, 2022. At 129,428,000 ft3 (3,665,000 m3), it is the eighth-largest building in the world by volume as of 2022.
Source: Wikipedia — Vehicle Assembly Building (CC BY-SA 4.0)