Monte Alban is the most important archaeological site of the Valley of Oaxaca. The main part of the ceremonial centre which forms a 300 m esplanade running north-south with a platform at either end was constructed during the Monte Albán II (c. 300 BC-AD 100) and the Monte Albán III phases. The ceremonial centre of Monte Alban has created a grandiose architectural landscape which represents one of a kind artistic achievement. The archaeological site of Monte Alban has been well preserved and conservation and management actions have centred on maintaining its physical integrity. This joint effort allows the INAH and the municipality, within their authorized powers, to control architectural projects and proposed development in the Historic Centre.