A rare, undisturbed royal tomb has been unearthed in Peru, revealing the graves of three Wari queens buried alongside gold and silver riches and possible human sacrifices.

Though the surrounding site has been looted many times, this mausoleum has managed to evade grave robbers for hundreds of years, archaeologists say.

Long before the Inca built Machu Picchu, the Wari empire flourished between A.D. 700 and 1000 throughout much of present-day Peru. At a time when Paris had just 25,000 residents, the Wari capital Huari was home to 40,000 people at its height, according to National Geographic, which reported the find.

Despite their reach, the Wari have remained somewhat mysterious, and it is rare for archaeologists to find burials that have not been ravaged by grave robbers. In hauling away treasures, looters destroy archaeological context and information, leaving researchers grasping for answers about how ancient people lived.

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But a team led by Polish and Peruvian archaeologists discovered an underground mausoleum that's being billed as the first unlooted Wari imperial tomb, sealed for centuries under 30 tons (27 metric tons) of loose stone fill.

The 1,200-year-old chamber was found in El Castillo de Huarmey, north of Lima. Milosz Giersz, an archaeologist at the University of Warsaw in Poland, told National Geographic that he first saw a faint outline of the mausoleum in aerial photographs of the site.

In digging through to the "temple of the dead," the team reportedly discovered rows of human bodies buried in a seated position (some of them suspected to be human sacrifices). They also found three Wari queens in small side chambers among valuable grave goods, such as gold tools for weaving, brilliantly painted ceramic vessels and a drinking cup carved from alabaster.

The queens may not have been laid to rest for good after they died. National Geographic also reported that there were traces of insect pupae found in the queens' bodies, suggesting that their mummies may have been periodically put out on display, left exposed to the open air, to be venerated by the living Wari people.

Over months of digging, the team unearthed more than a thousand artifacts from the site, including semi-precious stone beads, carved wooden artifacts, bronze axes and jewelry made from gold and silver Giersz told National Geographic that he expects the site will keep archaeologists busy for years to come.

Peru's Minister of Culture and other officials are set to officially announce the discovery today (June 27) in a press conference at the site.