Constructed within a natural sinkhole in Puerto Rico, the 305-meter-wide Arecibo ... It was the largest radio telescope in the United States from 1963 until it collapsed in 2020.

I n 1963, the Arecibo Observatory became operational on the island of Puerto Rico. Measuring 305 meters (~1000 ft) in ...

In 1974, the most powerful broadcast ever deliberately beamed into space was made from Puerto Rico. The broadcast formed part of the ceremonies held to mark a major upgrade to the Arecibo Radio ...

Plus, they can visit the observation deck to see the telescope and its radio mirror. There is also a gift shop on-site. Past travelers said the observatory is a great attraction in Puerto Rico ...