A major Inca archeological site is found on Aracar. Two separate places exist on the summit and the secondary crater. The summit place is formed by a stone circle and low stone walls which are placed just above the slopes down into the main crater. A terrace shaped stone structure forms the secondary crater place, being placed on its slopes. A smaller terrace is located on its northeastern side. Timber and wood are found around the stone structures. All these sites have dimensions of no more than . These structures may be a sanctuary site that could be accessed by a bystanding public during ceremonies, with the sites themselves located within wind protected areas.