What is "carhenge"

Carhenge is a replica of England's Stonehenge located near the city of Alliance, Nebraska, on the High Plains region of the United States. Instead of being built with large standing stones, as is the case with the original Stonehenge, Carhenge is formed from vintage American automobiles, all covered with gray spray paint. Built by Jim Reinders, it was dedicated at the June 1987 summer solstice. In 2006, a visitor center was constructed to serve the site.