Walk around the walls of this large structure and notice how it differs from others you have seen. Sun Temple was likely a communal building that played an important role in the Cliff Palace community. While this D-shaped structure resembles other Pueblo sites such as Pueblo Bonito in Chaco Canyon, it is the only building of its kind in the Pueblo world.

The skillfully crafted four-foot-thick walls indicate that extensive effort went into Sun Temple's construction. Archeologists excavated 24 rooms of various shapes and sizes as well as three circular structures inside the main complex. An additional circular structure stands detached to the southeast. No roof beams or household goods were found.

Some experts suggest that the walls of Sun Temple may have been used by observers in Cliff Palace as a marker for astronomical events like the winter solstice sunset. Perhaps the builders intentionally left sun temple unroofed, as an observatory for such events, or perhaps it was never finished. Many questions remain.