Gum Wall

The Gum Wall is a brick wall situated beneath Pike Place Market in Seattle, Washington, United States. Located on Post Alley near Pike Street, south of the market's main entrance off 1st Avenue, the wall is covered with used chewing gum. This accumulation on the walls measures several inches in thickness, reaching a height of 15 feet (4.6 m) along a 50-foot (15 m) section. It originated inadvertently around the Market Theater in the 1990s and later evolved into a tourist attraction and local landmark. Since 2015, the gum wall has been regularly cleaned to prevent erosion of the brick walls.