Mystical Horizons, Solar calendar sculpture in Turtle Mountains, North Dakota, US.
Mystical Horizons is a sculpture made of granite pillars arranged on a hilltop in the Turtle Mountains to function as a solar calendar. The work commands views across hundreds of miles of flat farmland and open prairie below.
Jack Olson, an aerospace engineer who worked on the Apollo Lunar Module, designed this modern interpretation and built it before his death in 2001. His background in space exploration informed the creation of this work rooted in ancient astronomy.
The six stone walls with slots allow sunlight to pass through at specific times tied to the year's turning points. Visitors can witness these solar events directly by observing where light falls on the ground.
The site is free to visit at 106th Street Northeast in Bottineau and offers paved parking for convenient access. Wear sturdy shoes since exploring the hilltop sculpture requires walking, and be prepared for exposure to wind and open sun.
A metal sighting tube remains permanently fixed toward Polaris at the location, marking the celestial constant that ancient navigators relied upon. A human-sized sundial also tracks the hours of daylight, making the sculpture function as both a celestial and temporal instrument.
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