300 mysterious paintings in a cave with no sunlight: For 1500 years, Native Americans kept returning to this site. Now scientists know why

Deep inside a cave where sunlight never reaches, generations of Native Americans kept returning for nearly 1,500 years to leave behind paintings that still puzzle researchers today. Hidden in the "dark zone" of Missouri's Picture Cave, more than 300 pictographs have now helped scientists piece together a long history of ritual, belief and cultural continuity that stretches from the first century CE to the 1600s.

A new study published in the journal American Antiquity has dated pigments used in 24 of these paintings, offering the clearest timeline yet for one of North America's most important Indigenous rock art sites.

Cave paintings span nearly 1,500 years

Researchers collected tiny samples of red and black pigments from selected pictographs and used radiocarbon dating to estimate when they were created. Their findings suggest the oldest artwork may date back as early as 85 CE, while the newest paintings were likely made around 1630 CE.


Overall, the paintings were created over a period of roughly 905 to 1,480 years. The long timeline shows that Picture Cave remained an important ceremonial place through major cultural changes, from the Woodland period to the later Mississippian period.

The cave's paintings are located in an area where no natural light enters, suggesting they were not made for everyday viewing. Instead, researchers believe the site was reserved for sacred rituals and spiritual ceremonies.

Ancient beliefs recorded on cave walls

According to the study, many of the images reflect Siouan cosmology and may have been created by communities connected to greater Cahokia, where the ancestors of today's Omaha, Osage, Ponca, Kansa and Quapaw nations once lived.

Earlier research carried out with tribal elders identified one important figure in the cave as Morning Star, also known as Hawk or the Symbolic Man. The image represents the first sunrise in Siouan tradition. The latest dating study places that particular pictograph at around 980 years old, during the Mississippian period.

Other paintings are even older and belong to the Woodland period, showing that the cave remained a sacred place across many generations despite changes in society.

As per Smithsonian Magazine, Anthropologist Carol Diaz-Granados, who has studied the site for two decades, said the artwork is remarkable for its level of detail. "[Y]ou get actual clothing details, headdress details, feathers, weapons. It's truly amazing."

She also criticised the decision to sell the site, saying, "Auctioning off a sacred American Indian site truly sends the wrong message. It's like auctioning off the Sistine Chapel."

Her research partner James Duncan said the paintings carried deep spiritual meaning. "The artists who put them on the wall did it with a great deal of ritual, and I'm sure there were prayers, singing—and these images are alive." He added, "Most of them are people—humans—but they're not of this world; they're supernatural."

Sale of sacred site sparked opposition

Picture Cave, located about 60 miles west of St. Louis, was sold at auction in 2021 for $2.2 million to an anonymous buyer despite objections from the Osage Nation, which had hoped to acquire and protect the property.

According to IFL Science, in a statement, the Osage Traditional Cultural Advisors Committee said, "The Picture Cave archaeological site in Warren County Missouri, can be considered one of the most important cultural and sacred sites to the Osage People."

The committee added, "The Picture Cave site pictographs, are unique in that they provide a visual record of the lifeways, religion, and ways of our ancestors."

Following the sale, the Osage Nation called the outcome "truly heartbreaking," stating, "Our ancestors lived in this area for 1,300 years. This was our land. We have hundreds of thousands of our ancestors buried throughout Missouri and Illinois, including Picture Cave."

The National Trust for Historic Preservation later included Picture Cave on its 2021 list of America's 11 Most Endangered Historic Places. Katherine Malone-France, the organisation's chief preservation officer, said, "Picture Cave is an enduring link between the Osage people and the land they were forced to leave over two hundred years ago. The new owner of this sacred place has an opportunity to demonstrate respect for the Osage people's historic and spiritual connection to Picture Cave by coming forward in the spirit of cooperation and working with the Tribe on a plan for preservation of the site."

Although the cave remains privately owned, researchers and Indigenous elders have continued to receive access for ongoing study. The latest dating evidence further highlights why Picture Cave has remained one of the most significant sacred sites in Native American history for centuries.