The quarry where all the
statues were carved!

 See the face in the upper right above?
That is an uncompleted statue

All the statues in these pictures are complete
just buried in the soil, they were awaiting
transportation to their final destination

This would have been the largest statue carved,
don't know how they thought they were going
to move it if they completed it!

See the statue in the hill reclining?

The only statue of a different type of design they have different theories on what this might be.