AN ARTEFACT OF PRIEST KING : It's possible that people in that civilisation use this as an art piece and respect this beautiful and expensive artwork as priest king is like a leader to them.
ROOM OF THE SKELETONS : The room in the center of the picture is where skeletons were kept.It is thought to be the remains of a massacre.
LARGE COURTYARD : It is probably to investigate the underlying room as the courtyard is filled with a solid mud brick platform.