(The links to photos by others, of this interesting site,
are back at my website.)

 Carved in the granite floor is what looks like the head of a condor that is lying down, with
white ruff at the neck, and the impressive part is the appearance of the huge stones behind it.
 Those are natural rocks placed in the configuration of a condor's outstretched wings, and
they house niches and an altar.
  For the Incas, the condor was the symbol of strength.