In July 2023 my son and I spent a week in Durango, CO doing all the fun summer stuff we could including rafting down the Animas river, riding the Durango & Silverton narrow gauge train, a tour of Mesa Verde National Park and a visit to Chimney Rock National Monument. Chimney Rock is only about an hour drive from Durango.
Visiting Chimney Rock National Monument in southwestern Colorado was like stepping into a portal that connected earth, sky, and the ancient humans that once occupied that land. As we hiked the ridge trail that winds up to the base of the two towering rock pinnacles—Chimney Rock and Companion Rock—I couldn’t help but marvel at the beauty and significance of this unique spot.
The landscape stretched wide in every direction, with the San Juan Mountains rising in the distance and the valley below. I could easily make out Peterson’s ridge or mesa across the way from the great house where I was told there were even more kivas and ruins. But what moved me most was not just the natural beauty—it was the knowledge that this was once a place of profound astronomical observation and ceremonial importance for the ancestral Puebloans over a thousand years ago.
Standing on that high ground, I learned how the people who lived here built structures and aligned them with cardinal points and astronomical events. Most striking was the alignment with the major lunar standstill, a rare event that occurs roughly every 18.6 years. From a specific vantage point at the Great House Pueblo, the moon rises precisely between Chimney Rock and Companion Rock during this event—a phenomenon that must have been deeply significant to them. It’s amazing to think that they observed and tracked the cycles of the moon with such precision, incorporating that knowledge into their architecture, ceremonies, and culture.
The deeper I explored the site and its history, the more I appreciated how attuned these people were to the rhythms of the cosmos. This wasn’t just a village or a ceremonial site—it was an observatory built into the land itself. To witness the same skies, the same rock formations, and to walk among their ruins was both humbling and inspiring. Chimney Rock reminded me that long before telescopes and digital star charts, humans were already charting the heavens and weaving that knowledge into the heart of their culture.
One of the most fascinating aspects of Chimney Rock National Monument is its connection to Chaco Canyon, over 90 miles to the south in what is now northwestern New Mexico. The ancestral Puebloans, who built and inhabited both places, created an expansive and interconnected world, and there’s compelling evidence that Chimney Rock played a specific role in this larger Chacoan network—both spiritually and physically.
Communication between Chimney Rock and Chaco Canyon may have taken several forms. One widely accepted theory involves signal fires or reflected sunlight from mirrors made of mica or other shiny materials. The high elevation of Chimney Rock, with its commanding view of the surrounding landscape, would have made it an ideal spot for sending visual signals across long distances. It’s believed that line-of-sight signaling stations—hilltop points visible from one another—formed a relay system, allowing messages to travel rapidly across vast stretches of rugged terrain.
There’s also a more symbolic form of communication at play. The architecture at Chimney Rock, particularly the Great House Pueblo built near the twin pinnacles, closely mirrors the monumental buildings of Chaco Canyon, suggesting shared cultural practices and coordinated construction efforts. Archaeologists believe that people from Chaco likely traveled to Chimney Rock during major celestial events, like the lunar standstill, to conduct ceremonies and reinforce their cultural and political ties.
In that way, communication wasn’t just about sending messages—it was about sustaining relationships, aligning ceremonial calendars, and maintaining a unified worldview across great distances. Chimney Rock may have functioned as a kind of satellite ceremonial center, synchronizing its activities with those of Chaco and strengthening the broader ancestral Puebloan society that spanned hundreds of miles.
Visiting Chimney Rock National Monument in southwestern Colorado is a journey into both breathtaking natural beauty and profound ancient knowledge. Perched high on a mesa with panoramic views of the surrounding landscape, this ancestral Puebloan site holds deep spiritual and astronomical significance. Most notably, it is aligned with the rare lunar standstill event, a phenomenon that occurs only once every 18.6 years and was likely central to ceremonial life. The structures built here over a thousand years ago reflect a sophisticated understanding of lunar cycles and a deep connection between earth and sky, reminding us that this was not only a place of dwelling but a sacred observatory for a people who watched the heavens with wonder and purpose. If you’ve never visited Chimney Rock I hope this page has piqued your interest in doing so, and that you have the opportunity soon.
Clear skies,
Scott
This was fascinating Scott! So well written and easy to read and understand. Sheila Jack