 El Tajín, a ruined city that reached its apex between the 9th and 13th centuries ad, was designated a UNESCO World Heritage site in 1992.El Zapotal is an archeological site which was discovered in 1971 in a region known at Mixtequlla (between the Blanco and Papaloapan Rivers).This site is noted for its clay figurines with smiling faces, part of an extremely large offering in honor of the god of death Mictlantecuhtli.