The Graffiti Tunnel in London, also known as Leake Street Tunnel, is a vibrant and ever-changing canvas of colorful murals tucked away beneath Waterloo station. Since its transformation from a dank and grimy space to a legal graffiti wall in 2008, the tunnel has become a hotspot for street artists to showcase their work. With a rich history and a constant flow of new pieces, it's a must-visit for anyone looking to experience the dynamic London street art scene.