Join this guided walking trip to explore the colorful streets of Lisbon and discover an open-air gallery of today's most innovative urban street artists. See graffiti and sophisticated murals, and get a feel for the locals. Encounter whimsical murals of lizards and horses on the side of an entire building, along with political and social statements such as Obey's "Revolution Mural" as a contrast to the wealth of the surrounding area. See small masterpieces concealed in the hidden alleys of the old town and large-scale installations in wide-open areas. Look at works in progress and admire art that has been there for decades.