Inca architecture used massive stonework, but without the wheel, and without elephants or oxen.   The stones were rough-cut to the approximate shape in the quarries using cobblestones for tools.  The stones were shaped into their final form at the building site and then pushed up earthen ramps.  The labor, supervised by Inca architects, was carried out by people fulfilling their labor obligations, in lieu of tax, since there was no monetary system.