In downtown San Luis Obispo, California, tourists are flock to the disgustingly intriguing Bubblegum Alley.
True to its name, the 15-foot high, 70-foot long alley is covered with chewed gum.
The wall began sometime in the 1950's.
The wall was cleaned twice in the 70's for being unsanitary, but has escaped any further cleaning, and stands today as an alluring tourist attraction.
Many artists have contributed chewed gum artwork to the wall.
This is what I call "gross cool".