Monte Alban

Monte Alban outside Oaxaca (pronounced Wahaca, like the restaurant) is an Aztec or, more correctly, Mexica site first settled around 2000BC.  The ceremonial area in the first photo is close to a typical layout seen at most sites - Aztec, Toltec, Mayan etc.
The second is our group wandering in what we thought was heat, we didn't know what was to come.