A chewing-gum sticking phenomenon that began in Seattle in the early 1990s is now appearing in European historic cities, according to multiple reports. The practice started when a single piece of gum was stuck to a wall in Seattle and grew into what is now known as “Gum Wall,” which has become an established tourist attraction. The same concept is now said to be taking hold “across the Pond,” with visitors reportedly adding gum to walls at tourist locations in Europe. Doctors cited in the coverage warn that the habit can create unsanitary conditions, including the buildup of bacteria and the formation of “walls of bacteria.” While the gum-walling sites are presented as points of interest for visitors, the reporting also highlights concerns about hygiene and public health. Overall, the articles describe a spread of a long-running attraction-style practice from the United States to Europe, alongside criticism from medical professionals about potential contamination as gum accumulates on surfaces in public spaces.