South of Las Monjas, in an area known as Chichén Viejo (Old Chichén) and only open to archaeologists, are several other complexes, such as the Group of the Initial Series, Group of the Lintels, and Group of the Old Castle.
Tri najbolj znane skupine so: Velika severna platforma s spomeniki El Castillo, Tempelj bojevnikov in Veliko igrišče, skupina Osario, ki vključuje piramido z istim imenom in tempelj Xtoloc ter centralna skupina s El Caracolom, Las Monjas in Akab Dzib.