The cityscape of Berlin displays large quantities of urban street art. It has become a significant part of the city's cultural heritage and has its roots in the graffiti scene of Kreuzberg of the 1980s. The Berlin Wall itself has become one of the largest open-air canvasses in the world. The leftover stretch along the Spree river in Friedrichshain remains as the East Side Gallery. Berlin today is consistently rated as an important world city for street art culture.