ional Geographic, and the second by private interests. Both projects were supervised by Mexico's National Institute of Anthropology and History (INAH). INAH has conducted an ongoing effort to excavate and restore other monuments in the archaeological zone, including the Ossario, Akab D�zib, and several buildings in Chich�n Viejo (Old Chichen).
In 2009, to investigate construction that predated El Castillo, Yucatec archaeologists began excavations adjacent to El Castillo under the direction of Rafael (Rach) Cobos
