BUBBLEGUM ALLY , SAN LUIS OBISPO, CALIFORNIA
Said to be the 8th wonder of the world. Bubblegum alley in San Luis Obispo is a 15-foot high and 70-foot long alley lined with chewed gum left by passers-by.
Historians believe that the tradition of the Alley started after WWII The gum wall is even a wall reflecting current pop culture as you can often see notes on political / world events written in the discarded gum. Its a ever changing, growing, colorful mosaic.