Work is ongoing at the Filo Bobos archeological project, some 15km from Tlapacoyan, where you can explore two of the several pre-Hispanic sites identified along the Río Bobos valley, El Cuajilote and Vega de la Peña. Both are worth visiting as much for the beauty of their locations, the birdlife and the serenity, as for the ruins themselves. No one yet knows for certain who occupied the Filo Bobos sites. Signs of a fertility cult suggest a Huastec influence, yet the other sculptures found are more Totonac in style, and the earliest buildings at El Cuajilote, which may date as far back as 1000 BC, are decidedly Olmec. Archeologists speculate that Filo Bobos was the centre of an as yet unknown Mesoamerican civilization, which provided an important trade link between the Gulf coast, its environs and the central valleys.