Arecibo Observatory
Radio observatory in Arecibo, Puerto Rico
Owned by the US National Science Foundation (NSF), an observatory in Barrio Esperanza, Arecibo, Puerto Rico, which also goes by the name National Astronomy and Ionosphere Center (NAIC) and was once the Arecibo Ionosphere Observatory.
Photo: Mariordo (Mario Roberto Durán Ortiz), CC BY-SA 4.0