Since we’ve visited TripAdvisor’s Top 2 germiest tourist destinations (the Blarney Stone and Seattle’s Bubblegum Wall), we thought it apropos to add a third to our repertoire: the Bubblegum Alley in San Luis Obispo.

This particular bubblegum wall pre-dates the wall in Seattle by many decades. It’s thought to have started after World War II by San Luis Obispo High School students looking for a unique graduation activity.

Over the decades the wall has grown rather largely and messily. It’s interesting to see what people can create when they are given a stick of bubblegum and a bit of imagination.

It’s dirtier than the one in Seattle (no surprise given its age) but doesn’t smell as bad. It also makes me wonder what sort of information an Urban Archaeologist could glean from this heaping mass of gooey gunk that came from people’s mouths.