For unknown reasons, many people migrated out of San Lorenzo in 800 BC to the nearby city of La Venta. However, San Lorenzo was repopulated in 600 BC, when it became a center for Olmec ritual sacrifices until the population faded away in 400 BC along with the Olmec civilization. Today, San Lorenzo remains a significant archaeological site because the artifacts found there–including the famous Colossal Heads and jade masks–shed some light on Olmec culture and its profound influence on later Mesoamerican civilizations, such as the Aztec and Maya.