Art can be a personal experience, and communal creations that change with each participant might seem like an inviting tourist draw. Yet, the sprawling Gum Wall near the Market Theater in Seattle, Washington, quickly turns unappealing upon closer inspection. It all began when theatergoers started pressing pennies onto the wall with their chewed gum, a quirky habit that caught on and ballooned in popularity as others joined in.

The result? Millions of sticky, used gum wads now coat the walls along nearby pathways, far from any vision of hygiene. Indeed, this unusual landmark holds a less-than-flattering distinction: it’s listed among North America’s top five most germ-infested tourist sites.

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