Mexico is famous for its muralists, particularly Rivera, Orozco and Siqueiros in the second quarter of the last Century. The works were always political, commissioned to glorify the Mexican Revolution and they still take up pride of place in most Mexican cities' public buildings.
It's less common now to see big mural commissions, but the official or unofficial work of Mexican graffiti artists can be found on the sides of countless buildings in Mexico City.
Not to be left out, we've been working with an agency here called All City Canvas to invite the British artist D*Face (aka Dean Stockton) to Mexico City. Here he is at work on the side of a 6-storey hotel in the Roma Sur neighbourhood. It's a kind of Day of the Dead theme - very striking. See 57 second video here.