Gum wall, Pike Place Market, Seattle, USA (@ Jordan Siemens/Getty Images)
- Adorning the wall of this theatre is an astounding array of used chewing gum.""It\s setting all sorts of box office records
- Are you looking at the most disgusting tourist attraction known to man?""Amazingly not - this is number one
- People have been leaving their colourful contributions here for 20 years.""Only in America
- Fantastic contraptions are used to rid pavements the world over of this irritating urban blight.""What\s the DIY alternative?