Leake Street, also known as the Banksy Tunnel, is a cool spot in Lambeth, London where graffiti is totally legal and encouraged, even though it's technically against the law on public property. The tunnel is about 300 meters long and runs under Waterloo station, with walls covered in awesome street art. It all started with Banksy's Cans Festival in 2008, and since then, the tunnel has become a popular spot for artists to showcase their work. So, if you're into urban art and want to see some rad graffiti, Leake Street is the place to be!