The mystery surrounding the tomb of the last Inca emperor - and its reputed treasure - might be closer to being solved.

While the facility wraps up its restoration of objects, officials plan to open on Saturdays for a peek at the results of a $9-million conservation effort.

The graceful birds once swarmed to the 236-year-old mission each spring, flying from the pampas of southern Argentina to nest in the stone ruins of the mission's earthquake-damaged church.