Area.Fifty.One is a building in Domino City in the Yu-Gi-Oh! anime. Unlike other text appearing on buildings, its name is not completely erased in the English dub. However, it is partially obscured, but for the most part it is still visible.
The name is a reference to Area 51, a classified United States Air Force facility, which is commonly the subject of alien-related conspiracy theories.
- Yu-Gi-Oh! episode 07070: "Double Duel, Part 1"