Olmec colossal heads by Matthew Stirling in 1938 spurred the first archaeological investigations of Olmec culture. Seventeen confirmed examples are known from four sites within the Olmec heartland on the Gulf Coast of Mexico. Most colossal heads were sculpted from spherical boulders but two from San Lorenzo Tenochtitlán were re-carved from massive stone thrones. An additional monument, at Takalik Abaj in Guatemala, is a throne that may have been carved from a colossal head. This is the only known example from outside the Olmec heartland. Dating the monuments remains difficult because of the movement of many from their original contexts prior to archaeological
Mayan languages body of literature has been written in Mayan languages. The earliest texts to have been preserved are largely monumental inscriptions documenting rulership, succession, and ascension, conquest and calendrical and astronomical events. It is likely that other kinds of literature were written in perishable media such as codices made of bark, only four of which have survived the ravages of time and the campaign of destruction by Spanish missionaries. Shortly after the Spanish conquest, the Mayan languages began to be written with Latin letters. Colonial-era literature in Mayan languages include the famous "Popol Vuh", a mythico-historical narrative written in 17th century