London, UK

London remains the UK’s top street art city, boasting a density of landmark pieces that surpasses #6 Buenos Aires by a factor of three. In Shoreditch, the epicentre since the early 2000s, over 40 of Banksy's original stencilled works survive behind perspex panels—more than in any other global hub. Brick Lane and its arteries host an ever-changing rotation from Zabou, ROA, and international artists, supported by the annual Upfest festival that draws 50,000+ visitors. This live-sketchbook energy, combined with Bristol's rival concentration of Banksy pieces, cements London as an unmatched European canvas.