1. London, England Berit Watkin / Creative Commons / Via Flickr: ben124 The early stomping ground of the notorious, and anonymous, street artist Banksy, London is also home to Shepard Fairey, creator of Barack Obama's iconic HOPE poster. 2. Bushwick, Brooklyn The Bushwick Collective / Via Facebook: TheBushwickCollective Home to The Bushwick Collective, among other artists and groups, this section of Brooklyn is a standout among New York's huge street art scene. Take a free tour or discover the newest artwork on your own. 3. São Paulo, Brazil Jack Zalium / Creative Commons / Via Flickr: kaiban The awesomely-named Beco de Batman, aka Batman's Alley, is a narrow, winding alley covered in an ever-evolving collection of street art. 4. Lodz, Poland Beth / Creative Commons / Via Flickr: bethmoon527 Known for massive, and insanely detailed, several-stories-high murals, street artist duo Etam Cru exemplifies Polish street art. 5. Berlin, Germany upload.wikimedia.org Sometimes the ickiest art is the most thought-provoking. Berlin's street art scene developed from Berlin Wall-era protest art, famously lining the East German side of the wall, part of which can be seen in the Friedrichshain-Kreuzberg neighborhood. 6. Prague, Czech Republic Hilde Skjolberg / Creative Commons / Via Flickr: hebe Prague's Lennon Wall, aptly named after a graffiti portrait of John Lennon and later used to protest communism, is continually repainted, acting as a symbol of global peace. 7. Moscow, Russia Dmitry Dzhus / Creative Commons / Via Flickr: nothingpersonal Moscow graffiti, a colorful reaction to Soviet-era uniformity, often throws in a history lesson, commemorating famous artists, writers, and historical figures. 8. Istanbul, Turkey Conmion / Creative Commons / Via Flickr: fundstueck This ancient city is covered in street art, and there's even a free iPhone app to get updates on the latest pieces. 9. Los Angeles, California Flickr: lord-jim / Via laist.com Home to a myriad of local movements and styles, several Los Angeles art galleries cultivate and encourage the street art scene. 10. Lisbon, Portugal Manuel Faisco / Creative Commons / Via Flickr: arteurbana Lisbon has a long history of street art, dating back to the 1700s, after all-white buildings were rebuilt with colorful paint and tiles following an earthquake. 11. Dublin, Ireland William Murphy / Creative Commons / Via Flickr: infomatique This walking route hits the major hotspots for Dublin street art, with Windmill Lane, the home of U2's former recording station, as the highlight. 12. Philadelphia, Pennsylvania lil'bear / Creative Commons / Via Flickr: lilbear Philadelphia has a handful of free self-guided tours devoted to street art, including one which follows a passionate love story painted across 50 scattered murals.