Banksy Tunnel is a 300-meter graffiti-covered road that runs beneath Waterloo station in London. The project began in 2008, when the celebrated artist invited other artists from around the world to share their work on the walls of this tunnel road. What was once a dark and dingy street is now filled with colorful images of political expression, clever cartoons, and artistic slogans. Although graffiti is illegal in London, Banksy Tunnel has become an authorized graffiti area, with artists continually contributing to its ever-changing walls.