Dainzú Ruins are about 24 km (15 mi.) s.e. of Oaxaca on a paved road off Mex. 190, on the way to Mitla; watch for the signed turn-off. Believed to be one of the final evidences of Olmec civilization in the Oaxaca region, their zenith was from around 600 B.C. to A.D. 200, before the better-known Monte Albán. A pyramidal structure (Edificio A) and a partially restored ball court can be seen, along with artwork portraying ball players and carvings of jaguars, rabbits and dancers.
Underground connecting tunnels can be explored, but they are dark, claustrophobic and have steep stairs.
Guided tours are available. Picnicking is permitted.