Until recently, street art was an underground phenomenon, often considered vandalism. A couple of years ago, the art of the streets became a topic of debate for historians and art critics. Presented in leading world museums and galleries, it has become mainstream current in the art world. Here are some examples of how street-art can change a city:

Huge Street Art Murals Transform City Of Lodz In Poland

London: East End street art tour brings city to life

Will Kraków Become the New Global Street Art Capital?