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What kinds of monuments did the Olmec build at San Lorenzo and La Venta?

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Map of Mesoamerica showing the geographic distribution of various Indigenous peoples, with regions labeled for groups such as the Maya, Nahua, Zapotec, Mixtec, Otomi, Mazahua, Huastec, Tarasco, and others across present-day Mexico and parts of Central America. Boundaries indicate the approximate areas inhabited by each group. — Mesoamerican Indian Distribution of Meso-American Indians.

The Olmec were master sculptors who constructed significant ceremonial centers at San Lorenzo and La Venta. Their architectural and artistic legacy includes:

San Lorenzo

As the oldest known Olmec center, San Lorenzo featured a plateau modified by human labor, including the construction of long ridges and approximately 200 small mounds that supported pole-and-thatch dwellings. The site is most famous for its extraordinary basalt monuments, most notably the "colossal heads"—massive human portraits wearing helmetlike headgear, which may represent rulers or players of a ritual rubber-ball game.12

La Venta

La Venta became the most important Mesoamerican settlement between 800 and 400 BCE. Its monuments include:34
* The Great Mound: A 100-foot-high fluted cone of earth and clay, potentially housing a ruler's tomb.34
* Ceremonial Enclosures: A plaza flanked by long mounds and an enclosure surrounded by a fence of upright columnar basalt shafts.4
* Mosaic Pavements: Elaborate jaguar masks made of stone, which were deliberately buried.3
* Sculptures: Continued production of colossal heads and "altars," as well as an increase in stelae and relief carvings depicting historical or contemporary scenes.4