'Star Axis' by Charles Ross

1971/1976 -
This naked-eye observatory, a kind of modern Stonehenge, is designed to illustrate the 26,000 year precession of the Earth on its axis as represented by the location and path of Polaris, the Pole star, through different eras. Other portions of the structure illustrate the movement of stars in an hour and the position of the sun at the equinox and solstices. It is still under construction, but near completion and should be opening very soon.