Yes! In fact, Oaxaca has some of the most breathtaking ruins in all of Mexico and Central America. The Zapotec civilization began in the Oaxaca region in the sixth century BCE. They flourished until the 1500s when European diseases and weapons decimated their numbers.
You can visit some of their ruins at Monte Alban (discussed above). Located just southwest of Oaxaca City, many local companies and resorts offer day trips and educational tours.