La Posta Astro-Geophysical Observatory
San Diego County, United States · built 1964
The La Posta Astro-Geophysical Observatory was a 60-foot-diameter (18 m) Navy Electronics Laboratory radio-telescope installation at Campo, California, US. Construction began in 1964 at a 3,900-foot-altitude (1, 200 m) site in the Laguna Mountains, 65 miles (105 kilometers) east of San Diego. It was dismantled in late 2015.
Observatory data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).