Here is an link to pictures of Bubblegum Alley in San Luis Obispo, CA. I have seen this in person and it is well worth visiting if you are the vicinity. At first, as you walk down this alley, it just seems cool and strange; then disorientation sets in along with the scary thought, “What if I trip and fall head first into this infectious, festering wall of gooey chewed gum.”
[Link courtesy of b^2]