What type of architecture did olmecs build?

The Great Pyramid, The Olmecs were the first civilization to build pyramids. The pyramids that they built resembles volcanoes, and was thought that they practiced a volcano cult. The "Great Pyramid" was the largest Mesoamerican structure of its time. Even today, after 2,500 years of erosion, it rises 34 meters above the naturally flat landscape.

Volcano-ish shaped pyramids? definitely pyramids of some sort, i think.