Sun Tunnels

Sun Tunnels is a large-scale installation in Utah's Great Basin Desert created by Nancy Holt in 1973. It consists of four large concrete cylinders, arranged on the desert floor in a cross pattern, that align with the sunrise and sunset on the summer and winter solstices. Each of the cylinders is also pierced with smaller holes representing the stars of four constellations: Draco, Perseus, Columba, and Capricorn.
- from utah.com