I said in the previous post that Marco sent me the León card and also a card from El Salvador, my 1st from there and from the only UNESCO site in the country. Joya de Cerén was declared a UNESCO World Heritage Site in 1993.
Joya de Ceren Archaeological Site is a pre-Columbian Maya farming village that has been preserved remarkably intact after it was destroyed by volcanic ash around 600 AD.
Loma Caldera, a nearby volcano, erupted and buried the village under 14 layers of ash. The villagers were apparently able to flee in time – no bodies have been found – although they left behind utensils, ceramics, furniture, and even half-eaten food in their haste to escape. The site was discovered in 1976 by Payson Sheets, a professor of anthropology. Since then the excavation process has continued. About 70 buildings have been uncovered.
Even more important than the buildings, however, are the paleoethnobotanical remains. The low temperature of the wet ash from Loma Caldera, as well as its rapid fall, ensured the preservation of much of the plant material. Of great importance is the discovery of manioc fields, the first time manioc cultivation had been found at a New World archaeological site. - in: http://www.worldheritagesite.org/sites/joyadeceren.html