David McCullough at Orozco Murals, by Unknown, , Smithsonian Archives - History Div, "Smithsonian World" host David McCullough provides human scale as he stands before the huge Orozco murals in the Preparatoria Nacional in Mexico City. The murals were featured in "Voices of Latin America," which aired 8 April 1987 on PBS (WETA-TV), and examined the life of five Latin American writers..