Sun Tunnels, Utah
Sun Tunnels is an artwork by Nancy Holt, completed in 1976, consisting of four large concrete tubes, laid out in the desert in an open X configuration. The nine foot diameter, 18 foot-long tunnels are pierced by holes of varying size that correspond with the pattern of selected celestial constellations. There is a tunnel for Draco, Perseus, Columba and Capricorn. The tunnels line up with the rising and falling sun of the summer and winter solstices. After the artist's death in 2014, its ownership was conveyed to the Dia Foundation of New York.